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Question 401Question →

A medical evacuation helicopter is dispatched from its base camp to pick up a patient at a rural hospital 120120 miles away. The pilot flies to the hospital at a steady speed of 120120 mph. Due to heavy headwinds on the way back, the helicopter's average speed for the entire round trip drops to 8080 mph. What is the helicopter's average speed, in mph, during the return flight?

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Answer: 60

Answer

60
By finding the total trip time (3 hours) and subtracting the outbound time (1 hour), we determine the return trip took 2 hours to cover 120 miles. Dividing the 120-mile distance by the 2 hours yields an average return speed of 60 mph.

Step-by-Step Solution

1
Calculate the total round-trip distance
240 miles
The one-way distance is 120 miles, so the full round trip is 120 + 120 = 240 miles.
2
Determine the total flight time
3 hours
Time equals total distance divided by the overall average speed (240 / 80 = 3).
3
Calculate the time taken for the outbound flight
1 hour
Time equals outbound distance divided by outbound speed (120 / 120 = 1).
4
Find the time taken for the return flight
2 hours
Return time is the total trip time minus the outbound trip time (3 - 1 = 2).
5
Calculate the average speed of the return flight
60 mph
Speed equals return distance divided by return time (120 / 2 = 60).

Key Concept

Average speed for a round trip is the total distance divided by the total time, not the arithmetic mean of the two different speeds.
Question 402Question →

A logistics supply convoy has a strict operational window of 7272 hours to complete its route. The first leg of the journey takes 11 day, 99 hours, and 4545 minutes. The second leg takes 830830 minutes. Before the final leg, the crew takes a mandatory rest period of 4.54.5 hours. How many minutes remain in the 7272-hour operational window for the convoy to complete the final leg?

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Answer: 1195

Answer

1195
The total operational window is 4,3204,320 minutes (72×6072 \times 60). The elapsed time includes 2,0252,025 minutes for leg 1 (33×60+4533 \times 60 + 45), 830830 minutes for leg 2, and 270270 minutes for rest (4.5×604.5 \times 60). The sum of these elapsed times is 3,1253,125 minutes. Subtracting the total elapsed time from the total available window leaves exactly 1,1951,195 minutes.

Step-by-Step Solution

1
Calculate total available time in minutes.
4,3204,320 minutes
Converting the 7272-hour window to a smaller, standard unit (minutes) makes the final subtraction easier.
2
Convert the duration of the first leg entirely into minutes.
2,0252,025 minutes
The first leg is mixed units (11 day, 99 hours, 4545 minutes). 11 day = 2424 hours, plus 99 hours = 3333 hours. 33×60=1,98033 \times 60 = 1,980 minutes, plus 4545 minutes = 2,0252,025 minutes.
3
Convert the rest period into minutes.
270270 minutes
4.54.5 hours requires conversion. 4.5×60=2704.5 \times 60 = 270 minutes.
4
Calculate the total time elapsed.
3,1253,125 minutes
Sum the durations: 2,0252,025 (leg 1) + 830830 (leg 2) + 270270 (rest) = 3,1253,125 minutes used.
5
Subtract the elapsed time from the total window.
1,1951,195 minutes
4,320−3,125=1,1954,320 - 3,125 = 1,195 minutes remaining for the final leg.

Key Concept

Converting mixed time units (days, hours, minutes, and fractional hours) into a single base unit to calculate remaining elapsed time.
Estimated Time:2m 30s
Question 403Question →

A Coast Guard search-and-rescue aircraft executes a mission over the ocean. It first flies directly to the designated search zone at an average speed of 180 mph180\text{ mph} for 11 hour and 2020 minutes. Once inside the zone, it slows to a search speed of 120 mph120\text{ mph}, flying a grid pattern for 22 hours and 1515 minutes. After completing the grid, it returns to base along a direct route at 150 mph150\text{ mph} for 4848 minutes. What is the total distance flown by the aircraft during the entire mission, in miles?

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Answer: 630

Answer

630
The correct total distance is 630 miles. This is found by carefully converting the travel times of all three mission legs into hours, calculating the distance for each leg using the formula Distance = Rate × Time, and then summing the three results together.

Step-by-Step Solution

1
Calculate the distance flown to reach the search zone.
180 mph * (4/3) hours = 240 miles.
Converting 1 hour and 20 minutes to 1.333... (or 4/3) hours is required to match the speed unit (mph).
2
Calculate the distance flown while searching the grid.
120 mph * 2.25 hours = 270 miles.
Converting 2 hours and 15 minutes to 2.25 hours is required to match the speed unit (mph).
3
Calculate the distance flown to return to base.
150 mph * 0.8 hours = 120 miles.
Converting 48 minutes to 48/60 or 0.8 hours is required to match the speed unit (mph).
4
Sum the distances from all three legs of the mission.
240 + 270 + 120 = 630 miles.
The total distance is the sum of the individual leg distances.

Key Concept

Calculating distance for multiple travel segments by independently converting mixed time units into hours and applying the Distance = Rate × Time formula.
Estimated Time:2m 30s
Question 404Question →

A topographic map uses a scale of 38 inch=15 miles\frac{3}{8}\text{ inch} = 15\text{ miles}. A rectangular section of a national forest is shown on this map with dimensions of 112 inches1\frac{1}{2}\text{ inches} by 214 inches2\frac{1}{4}\text{ inches}. If a conservation program plans to plant 400400 trees per square mile throughout this entire section, how many thousands of trees will be planted in total?

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Answer: 2160

Answer

2160
The correct answer is found by first determining the unit scale factor. Since 3/8 inch represents 15 miles, dividing 15 by 3/8 reveals that 1 inch represents 40 miles. Multiplying the map dimensions (1.5 inches and 2.25 inches) by 40 gives the actual dimensions of 60 miles and 90 miles. The actual area is the product of these dimensions, or 5,400 square miles. Multiplying the area by 400 trees per square mile yields 2,160,000 total trees. Finally, dividing by 1,000 gives the answer in thousands: 2,160.

Step-by-Step Solution

1
Calculate the unit scale (miles per inch).
38 inch=15 miles⇒1 inch=15×83=40 miles\frac{3}{8}\text{ inch} = 15\text{ miles} \Rightarrow 1\text{ inch} = 15 \times \frac{8}{3} = 40\text{ miles}.
Finding the value of 1 inch makes it much easier to convert the mixed-fraction map dimensions.
2
Convert the map width to actual miles.
112 inches=1.5×40=60 miles1\frac{1}{2}\text{ inches} = 1.5 \times 40 = 60\text{ miles}.
The linear scale applies directly to one-dimensional measurements.
3
Convert the map length to actual miles.
214 inches=2.25×40=90 miles2\frac{1}{4}\text{ inches} = 2.25 \times 40 = 90\text{ miles}.
Applying the same linear scale factor to the other dimension.
4
Calculate the actual area of the forest.
60 miles×90 miles=5400 square miles60\text{ miles} \times 90\text{ miles} = 5400\text{ square miles}.
The total planting area is required to determine how many trees are needed.
5
Calculate the total number of trees.
5400 square miles×400 trees/square mile=2,160,000 trees5400\text{ square miles} \times 400\text{ trees/square mile} = 2,160,000\text{ trees}.
Applying the rate of 400 trees per square mile yields the absolute total.
6
Convert the final answer to the requested unit (thousands).
2,160,000÷1000=2160 thousands2,160,000 \div 1000 = 2160\text{ thousands}.
The question specifically asks 'how many thousands of trees'.

Key Concept

Converting mixed-fraction map scales into actual dimensions to calculate applied area.
Question 405Question →

A military cargo aircraft flies from Base Alpha to Base Bravo at an average speed of 300300 miles per hour. Upon arrival, the aircraft spends exactly 11 hour and 3030 minutes on the ground being loaded. It then returns to Base Alpha along the exact same route at an average speed of 600600 miles per hour. If the total elapsed time for the entire mission, from the initial departure to the final return, was 77 hours and 3030 minutes, what was the aircraft's overall average speed, in miles per hour, for the entire mission?

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Answer: 320

Answer

The aircraft's overall average speed for the entire mission was 320320 miles per hour.
The correct overall average speed is found by first calculating the total distance traveled, and then dividing it by the total elapsed time for the mission. By subtracting the 1.51.5-hour ground delay from the 7.57.5-hour total time, we find the aircraft flew for a total of 66 hours. Using the relationship D300+D600=6\frac{D}{300} + \frac{D}{600} = 6, we find the one-way distance DD is 12001200 miles. Therefore, the total round-trip distance is 24002400 miles. Dividing the 24002400 miles by the total mission time of 7.57.5 hours yields an overall average speed of 320320 mph.

Step-by-Step Solution

1
Determine the actual time the aircraft spent flying.
77 hours and 3030 minutes total minus 11 hour and 3030 minutes on the ground equals 66 hours of flight time.
The total elapsed time includes the ground time, which must be subtracted to isolate the time spent traveling at the given speeds.
2
Set up an equation to find the one-way distance between the bases.
Let DD be the one-way distance. D300+D600=6\frac{D}{300} + \frac{D}{600} = 6
Time equals distance divided by rate. The sum of the time for the outbound flight and the return flight equals the total flight time.
3
Solve the equation for the one-way distance (DD).
D=1200D = 1200 miles
2D600+D600=6⇒3D600=6⇒D200=6⇒D=1200\frac{2D}{600} + \frac{D}{600} = 6 \Rightarrow \frac{3D}{600} = 6 \Rightarrow \frac{D}{200} = 6 \Rightarrow D = 1200.
4
Calculate the total distance traveled during the entire mission.
1200×2=24001200 \times 2 = 2400 miles
The mission is a round trip, so the one-way distance must be doubled.
5
Calculate the overall average speed for the entire mission.
2400÷7.5=3202400 \div 7.5 = 320 miles per hour.
Overall average speed equals total distance divided by total elapsed time (which includes the ground delay).

Key Concept

Overall average speed is the total distance traveled divided by the total elapsed time, which includes any stationary delays. It cannot be calculated by simply averaging the individual speeds.

Alternative Method

Instead of solving for distance first, you can use the harmonic mean of the speeds to find the average speed while in the air: 2×300×600300+600=400 mph\frac{2 \times 300 \times 600}{300 + 600} = 400 \text{ mph}. The aircraft flew for 66 hours at an average of 400 mph400 \text{ mph}, covering 24002400 miles. Then, divide 24002400 miles by the total mission time (7.57.5 hours) to find the overall average speed: 320 mph320 \text{ mph}.
Estimated Time:3m 0s
Question 406Question →

A homeowner is applying a protective sealant to a rectangular wooden patio that completely surrounds a rectangular swimming pool. The overall dimensions of the patio and pool together are 40 feet40\text{ feet} long and 30 feet30\text{ feet} wide. The swimming pool inside measures 25 feet25\text{ feet} long and 15 feet15\text{ feet} wide. One gallon of sealant covers exactly 150 square feet150\text{ square feet} of wood and costs $28\$28. If the homeowner must purchase whole gallons of sealant, what is the total cost, in dollars, of the sealant required for the wooden patio?

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Answer: 168

Answer

The total cost of the sealant is $168.
The net area of the patio is found by subtracting the pool area from the total area (1200−375=825 sq ft1200 - 375 = 825\text{ sq ft}). Dividing this by the coverage rate (825÷150=5.5825 \div 150 = 5.5) shows how many gallons are needed. Since partial gallons are not sold, this rounds up to 6 gallons6\text{ gallons}. At $28\$28 per gallon, the cost is 6×28=$1686 \times 28 = \$168.

Step-by-Step Solution

1
Calculate the total combined area of the patio and the pool.
1200 square feet1200\text{ square feet}
To find the gross area before removing the inner section, multiply the overall length by the width (40×3040 \times 30).
2
Calculate the area of the swimming pool.
375 square feet375\text{ square feet}
To find the area that does not require sealant, multiply the pool's length by its width (25×1525 \times 15).
3
Subtract the pool area from the total area.
825 square feet825\text{ square feet}
To find the net area of the wooden patio that actually needs sealant (1200−3751200 - 375).
4
Divide the net area by the coverage of one gallon of sealant.
5.5 gallons5.5\text{ gallons}
To determine the exact volume of sealant required (825÷150825 \div 150).
5
Round up to the next whole gallon.
6 gallons6\text{ gallons}
Because the homeowner must purchase whole gallons, any fraction requires buying an additional full gallon.
6
Multiply the number of gallons by the cost per gallon.
$168\$168
To calculate the final total cost (6×286 \times 28).

Key Concept

Calculating net rectangular area by subtracting an inner rectangle from an outer boundary, and applying real-world constraints such as rounding up to whole purchasing units.
Estimated Time:1m 30s
Question 407Question →

An interior designer is planning to cover a rectangular accent wall with custom wallpaper. The wall measures 15 feet15\text{ feet} in width and 8 feet8\text{ feet} in height. If the wallpaper costs $4\$4 per square foot, what is the total cost, in dollars, of the wallpaper needed for this wall?

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Answer: 480

Answer

480
The wall is a rectangle, so its area is found by multiplying the width (15 feet15\text{ feet}) by the height (8 feet8\text{ feet}), which equals 120 square feet120\text{ square feet}. Since the wallpaper costs $4\$4 per square foot, multiplying the total area by the rate (120×4120 \times 4) gives a total cost of $480\$480.

Step-by-Step Solution

1
Calculate the area of the rectangular wall.
15×8=120 square feet15 \times 8 = 120\text{ square feet}
The area determines how much surface the wallpaper needs to cover.
2
Calculate the total cost of the wallpaper.
120×4=480 dollars120 \times 4 = 480\text{ dollars}
Multiplying the total square footage by the cost per square foot provides the final amount.

Key Concept

Calculating rectangular area and applying a unit cost rate.
Question 408Question →

A rectangular reservoir for a water purification system measures 2020 feet long, 1515 feet wide, and 1010 feet deep. Safety protocols dictate that the reservoir must never exceed 90%90\% of its total volume capacity. The reservoir currently contains 900900 cubic feet of water. If a high-capacity pump adds water to the reservoir at a rate of 6060 cubic feet per minute, how many minutes will it take for the water to reach the maximum allowed capacity?

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Answer: 30

Answer

30
First, the total volume of the rectangular reservoir is found by multiplying its length, width, and depth (20×15×10=300020 \times 15 \times 10 = 3000 cubic feet). Next, the maximum allowed capacity is determined by finding 90%90\% of the total volume (0.90×3000=27000.90 \times 3000 = 2700 cubic feet). Since the reservoir already contains 900900 cubic feet of water, the exact amount needed to reach the maximum safe capacity is the difference (2700−900=18002700 - 900 = 1800 cubic feet). Finally, the time required to add this volume at a rate of 6060 cubic feet per minute is calculated by dividing the needed volume by the pump's rate (1800÷60=301800 \div 60 = 30 minutes).

Step-by-Step Solution

1
Calculate the total volume of the reservoir.
20×15×10=300020 \times 15 \times 10 = 3000 cubic feet
The total volume is required to determine what the absolute maximum capacity is before applying the percentage limit.
2
Calculate the maximum allowed capacity.
3000×0.90=27003000 \times 0.90 = 2700 cubic feet
Safety protocols dictate the reservoir cannot exceed 90%90\% of its total physical volume.
3
Determine the required volume of water to add.
2700−900=18002700 - 900 = 1800 cubic feet
The reservoir already contains 900900 cubic feet of water, so we only need to pump the difference to reach the safe limit.
4
Calculate the time required to fill the reservoir to the required level.
1800÷60=301800 \div 60 = 30 minutes
Time is calculated by dividing the total volume to be added by the filling rate of the pump.

Key Concept

Calculating rectangular volume, applying percentage constraints to capacity, and solving for time using a given rate.
Question 409Question →

A carpenter is preparing to install baseboards in a room. One specific section of the wall requires a continuous board that is exactly 22 yards and 22 feet long. What is the required length of this board in inches?

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Answer: 96

Answer

The required length of the board is 96 inches.
The correct total length is found by converting all measurements to the same unit. First, 2 yards is converted to 6 feet (2×3=62 \times 3 = 6). Adding the extra 2 feet gives a total of 8 feet. Finally, converting 8 feet to inches yields 96 inches (8×12=968 \times 12 = 96). Alternatively, you can convert both to inches directly: 2 yards = 72 inches, and 2 feet = 24 inches. Adding them together gives 72+24=9672 + 24 = 96 inches.

Step-by-Step Solution

1
Convert the yards measurement to feet.
2 yards = 6 feet.
It is easier to add measurements of the same unit (feet) before finding the final total in inches.
2
Calculate the total length in feet.
6 feet + 2 feet = 8 feet.
This combines both parts of the given measurement into a single unit.
3
Convert the total feet into inches.
8 feet * 12 inches/foot = 96 inches.
The question specifically asks for the final answer in inches, and there are 12 inches in every foot.

Key Concept

Converting compound US Customary linear measurements (yards and feet) into a single smaller unit (inches).
Question 410Question →

A cylindrical well is being drilled into the ground. The well has a diameter of 36 inches36\text{ inches} and a target depth of 70 feet70\text{ feet}. If soil is extracted from the well at a constant rate of 11 cubic feet per hour11\text{ cubic feet per hour}, how many hours will it take to drill the well completely? (Use 227\frac{22}{7} for π\pi)

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Answer: 45

Answer

45
The correct answer is found by first ensuring all measurements are in feet. A diameter of 36 inches36\text{ inches} is equal to 3 feet3\text{ feet}, making the radius 1.5 feet1.5\text{ feet} (or 32 feet\frac{3}{2}\text{ feet}). Using the formula V=πr2hV = \pi r^2 h, the total volume of soil is 227×(32)2×70=495 cubic feet\frac{22}{7} \times \left(\frac{3}{2}\right)^2 \times 70 = 495\text{ cubic feet}. Finally, dividing the total volume by the extraction rate of 11 cubic feet per hour11\text{ cubic feet per hour} gives exactly 45 hours45\text{ hours}.

Step-by-Step Solution

1
Convert the diameter to feet
36 inches=3 feet36\text{ inches} = 3\text{ feet}
Units must be consistent (feet) with the depth and the extraction rate before calculating volume.
2
Determine the radius of the well
r=1.5 feetr = 1.5\text{ feet} (or 32 feet\frac{3}{2}\text{ feet})
The volume formula requires the radius, which is half of the diameter.
3
Calculate the volume of the cylindrical well
V=227×(32)2×70=227×94×70=495 cubic feetV = \frac{22}{7} \times \left(\frac{3}{2}\right)^2 \times 70 = \frac{22}{7} \times \frac{9}{4} \times 70 = 495\text{ cubic feet}
This determines the total amount of soil that needs to be extracted.
4
Calculate the time required to drill the well
Time=49511=45 hours\text{Time} = \frac{495}{11} = 45\text{ hours}
Time is equal to the total volume divided by the rate of extraction.

Key Concept

Calculating the volume of a cylinder with unit conversions and applying it to a rate problem.
Question 411Question →

A circular water pipe has a diameter of 88 inches. What is the cross-sectional area of the pipe? Use π=3.14\pi = 3.14.

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Answer: 50.24

Answer

50.24 square inches
The area of a circle is calculated using the formula A=πr2A = \pi r^2. First, find the radius by dividing the diameter by 2 (8÷2=48 \div 2 = 4). Then, substitute r=4r = 4 and π=3.14\pi = 3.14 into the formula: A=3.14×42=3.14×16=50.24A = 3.14 \times 4^2 = 3.14 \times 16 = 50.24.

Step-by-Step Solution

1
Find the radius of the pipe.
Radius = 4 inches
The formula for the area of a circle requires the radius, which is exactly half of the diameter.
2
Calculate the cross-sectional area using the area formula.
Area = 50.24 square inches
Squaring the radius (16) and multiplying by 3.14 gives the total area of the circle.

Key Concept

Calculating the area of a circle given its diameter.
Question 412Question →

A contractor is applying a specialized primer to a rectangular warehouse wall that is 60 feet60\text{ feet} long and 18 feet18\text{ feet} high. The wall contains a rectangular loading bay door measuring 30 feet30\text{ feet} long and 12 feet12\text{ feet} high, which will not receive the primer. If the primer material costs $15\$15 per square yard, what is the total cost, in dollars, of the primer needed for the wall?

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Answer: 1200

Answer

1200
The total gross area of the wall is 60×18=1080 square feet60 \times 18 = 1080\text{ square feet}. The area of the unpainted loading door is 30×12=360 square feet30 \times 12 = 360\text{ square feet}. Subtracting the door's area yields a net area of 720 square feet720\text{ square feet} to be primed. Because 1 square yard1\text{ square yard} equals 9 square feet9\text{ square feet}, the net area in square yards is 720÷9=80 square yards720 \div 9 = 80\text{ square yards}. Finally, multiplying the 80 square yards80\text{ square yards} by the $15\$15 cost per square yard gives a total cost of $1200\$1200.

Step-by-Step Solution

1
Calculate the gross area of the warehouse wall.
1080 sq ft1080\text{ sq ft}
Multiply the length (60 feet60\text{ feet}) by the height (18 feet18\text{ feet}) to find the total rectangular area before accounting for the door.
2
Calculate the area of the loading bay door.
360 sq ft360\text{ sq ft}
Multiply the door's length (30 feet30\text{ feet}) by its height (12 feet12\text{ feet}) to determine the area that will not be painted.
3
Find the net area to be primed.
720 sq ft720\text{ sq ft}
Subtract the area of the door from the gross wall area (1080−3601080 - 360) to find the exact surface area requiring primer.
4
Convert the net square footage into square yards.
80 sq yd80\text{ sq yd}
Since the cost is given per square yard, and there are 9 square feet9\text{ square feet} in 1 square yard1\text{ square yard} (3 ft×3 ft3\text{ ft} \times 3\text{ ft}), divide the net area by 9 (720÷9720 \div 9).
5
Calculate the total cost of the primer.
$1200\$1200
Multiply the required area in square yards (8080) by the cost per square yard ($15\$15).

Key Concept

Calculating net rectangular area via subtractive cutouts and applying square unit conversions.
Question 413Question →

A coffee shop prepares cold brew coffee in large batches. Each batch produces exactly 33 gallons and 22 quarts of cold brew. The shop needs to completely fill three 44-gallon dispensers and two 22-gallon dispensers. If the shop has already prepared 704704 fluid ounces of cold brew, how many additional full batches must they prepare today to have enough cold brew to exactly fill all the dispensers?

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Answer: 3

Answer

3 batches
The correct answer is found by establishing a common unit of measurement, such as quarts. The total dispenser capacity is 16 gallons, which equals 64 quarts. The existing 704 fluid ounces is converted to 22 quarts (since there are 32 fluid ounces in a quart). Subtracting the 22 existing quarts from the 64 required quarts leaves 42 quarts needed. Finally, since one batch produces exactly 14 quarts (3 gallons + 2 quarts), we divide the 42 quarts needed by 14 quarts per batch to determine that 3 batches are required.

Step-by-Step Solution

1
Calculate the total required volume in gallons.
16 gallons
To find out the total capacity of the three 4-gallon dispensers and two 2-gallon dispensers.
2
Convert the total required volume from gallons to quarts.
64 quarts
Using a smaller common unit (quarts) makes it easier to subtract the existing fluid ounces and divide by the batch size.
3
Convert the already prepared cold brew from fluid ounces to quarts.
22 quarts
There are 32 fluid ounces in 1 quart. Dividing 704 by 32 gives the amount in quarts so it can be subtracted from the total.
4
Determine the remaining volume of cold brew needed.
42 quarts
Subtracting the existing volume (22 quarts) from the total required volume (64 quarts) gives the amount that still needs to be prepared.
5
Convert the volume of one batch to quarts.
14 quarts
One batch is 3 gallons (12 quarts) plus 2 quarts, which equals 14 quarts. This gives the unit rate per batch.
6
Calculate the number of additional batches needed.
3
Dividing the remaining needed volume (42 quarts) by the volume per batch (14 quarts) yields the exact number of batches required.

Key Concept

Converting and performing multi-step operations with US Customary units of capacity (gallons, quarts, and fluid ounces).
Estimated Time:2m 30s
Question 414Question →

A landscaper is designing a circular flower bed with a diameter of 1010 feet. She needs to install a flexible plastic border completely around the outer edge of the flower bed. What is the total length, in feet, of the plastic border needed? Use π=3.14\pi = 3.14.

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Answer: 31.4

Answer

31.4
The problem asks for the length of a border around a circle, which is the circumference. The circumference is found by multiplying the diameter (1010 feet) by π\pi (3.143.14), resulting in 31.431.4 feet.

Step-by-Step Solution

1
Determine the required measurement
Calculate the circumference
The plastic border goes around the outer edge of the flower bed.
2
Select the correct formula
C=π×dC = \pi \times d
We are given the diameter (1010 feet) and need the circumference.
3
Calculate the circumference
3.14×10=31.43.14 \times 10 = 31.4
Substitute π=3.14\pi = 3.14 and d=10d = 10 into the formula.

Key Concept

Circumference of a circle
Estimated Time:45s
Question 415Question →

A university is installing artificial turf on an indoor practice facility. The rectangular facility measures 120 feet120\text{ feet} in length and 60 feet60\text{ feet} in width. Inside the facility, there are two identical rectangular equipment zones, each measuring 30 feet30\text{ feet} long and 15 feet15\text{ feet} wide, which will remain bare concrete and will not be covered with turf. If the artificial turf costs $24\$24 per square yard, what is the total cost, in dollars, of the artificial turf needed for the facility?

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Answer: 16800

Answer

16800
The correct answer is found by calculating the total area of the facility (7,200 sq ft7,200\text{ sq ft}), subtracting the area of the two equipment zones (900 sq ft900\text{ sq ft}), converting the remaining area (6,300 sq ft6,300\text{ sq ft}) from square feet to square yards by dividing by 9 (700 sq yd700\text{ sq yd}), and finally multiplying by the cost per square yard (24)toget24) to get 16,800.

Step-by-Step Solution

1
Calculate the total area of the facility.
120×60=7,200 sq ft120 \times 60 = 7,200\text{ sq ft}
To establish the maximum possible area before exclusions.
2
Calculate the area of the two equipment zones that will not be turfed.
2×(30×15)=900 sq ft2 \times (30 \times 15) = 900\text{ sq ft}
The two zones are bare concrete, so their combined area must be subtracted from the total.
3
Subtract the equipment zones from the total facility area.
7,200−900=6,300 sq ft7,200 - 900 = 6,300\text{ sq ft}
To find the actual area that requires artificial turf.
4
Convert the turfed area from square feet to square yards.
6,300÷9=700 sq yd6,300 \div 9 = 700\text{ sq yd}
There are 9 square feet in one square yard (3 ft×3 ft3\text{ ft} \times 3\text{ ft}), and the turf is priced per square yard.
5
Calculate the total cost.
700×24=$16,800700 \times 24 = \$16,800
Multiplying the required square yards by the price per square yard gives the final cost.

Key Concept

Calculating area with subtractive regions and converting between square units.
Question 416Question →

A military convoy must travel a total distance of 540540 miles to reach a forward operating base. To ensure they arrive on schedule, they need to maintain an overall average speed of 4545 miles per hour for the entire journey.

During the first segment, they travel 150150 miles in exactly 150150 minutes. During the second segment, they travel 135135 miles at an average speed of 3030 miles per hour.

What average speed, in miles per hour, must the convoy maintain for the remainder of the trip to meet their target overall average speed?

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Answer: 51

Answer

The convoy must maintain a speed of 51 mph for the remainder of the trip.
To find the required speed for the remainder of the trip, you must determine how much distance is left and how much time remains. First, calculate the total time allowed for the trip: 540 miles÷45 mph=12 hours540 \text{ miles} \div 45 \text{ mph} = 12 \text{ hours}. The first segment takes 150 minutes÷60=2.5 hours150 \text{ minutes} \div 60 = 2.5 \text{ hours} to cover 150150 miles. The second segment takes 135 miles÷30 mph=4.5 hours135 \text{ miles} \div 30 \text{ mph} = 4.5 \text{ hours}. The total distance covered so far is 285285 miles (150+135150 + 135) over a total of 77 hours (2.5+4.52.5 + 4.5). This leaves 255255 miles (540−285540 - 285) to be covered in the remaining 55 hours (12−712 - 7). Dividing the remaining distance by the remaining time (255÷5255 \div 5) results in a required speed of 5151 mph.

Step-by-Step Solution

1
Calculate the total allowable time for the entire journey.
1212 hours
Total time is found by dividing the total distance (540540 miles) by the overall target average speed (4545 mph).
2
Convert the duration of the first segment into hours.
2.52.5 hours
To maintain consistent units, divide the given 150150 minutes by 6060 minutes per hour.
3
Calculate the time required for the second segment.
4.54.5 hours
Time equals distance divided by speed (135 miles÷30 mph135 \text{ miles} \div 30 \text{ mph}).
4
Determine the remaining distance and remaining time for the final segment.
Remaining distance: 255255 miles. Remaining time: 55 hours.
Subtract the completed distances (150+135=285150 + 135 = 285) from 540540, and subtract the used time (2.5+4.5=72.5 + 4.5 = 7) from 1212.
5
Calculate the required average speed for the final segment.
5151 miles per hour
Average speed equals remaining distance divided by remaining time (255÷5255 \div 5).

Key Concept

Average speed over multiple segments requires calculating total distance and total time, rather than taking the arithmetic mean of individual segment speeds.
Estimated Time:2m 0s
Question 417Question →

A community center is building a new rectangular sandbox for the playground. The sandbox measures 66 feet long, 44 feet wide, and 1.51.5 feet deep. How many cubic feet of sand are required to fill the sandbox completely to the top?

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Answer: 36

Answer

36
The correct answer is found by multiplying the three dimensions of the rectangular sandbox (66 feet, 44 feet, and 1.51.5 feet) together, which yields exactly 3636 cubic feet of total capacity.

Step-by-Step Solution

1
Identify the correct volume formula for a rectangular container.
V=l×w×hV = l \times w \times h
The total capacity of a rectangular sandbox is calculated by multiplying its three spatial dimensions together.
2
Substitute the provided measurements into the formula.
V=6×4×1.5V = 6 \times 4 \times 1.5
The given dimensions are a length of 6 feet, a width of 4 feet, and a depth of 1.5 feet.
3
Multiply the dimensions to find the total volume.
24×1.5=3624 \times 1.5 = 36
Calculating the final cubic footage required to completely fill the sandbox.

Key Concept

Calculating the volume of a rectangular container using the formula V=l×w×hV = l \times w \times h.
Question 418Question →

A warehouse worker is stacking identical shipping boxes. Each box is exactly 1616 inches tall. If the worker creates a single stack of 33 boxes, what is the total height of the stack in feet?

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Answer: 4

Answer

4 feet
The total height of the stack in inches is found by multiplying 1616 inches by 33, yielding 4848 inches. Because there are 1212 inches in 11 foot, dividing 4848 by 1212 gives the correct measurement of 44 feet.

Step-by-Step Solution

1
Calculate the total height in inches.
16×3=4816 \times 3 = 48 inches
To find the combined height of all 3 boxes before converting units.
2
Convert the total height from inches to feet.
48÷12=448 \div 12 = 4 feet
The question asks for the final height in feet, and there are 12 inches in a foot.

Key Concept

Converting US customary linear measurements (inches to feet).
Question 419Question →

A supply sergeant is reviewing the specifications for a rectangular storage pod. The pod has a known total volume of 120120 cubic feet. If the pod measures 66 feet in length and 44 feet in width, what is the height of the pod in feet?

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Answer: 5

Answer

5
The volume of a rectangular shape is determined by multiplying its length, width, and height (V=L×W×HV = L \times W \times H). Given a total volume of 120120 cubic feet, a length of 66 feet, and a width of 44 feet, the equation becomes 120=6×4×H120 = 6 \times 4 \times H. First, find the area of the base by multiplying the length and width (6×4=246 \times 4 = 24). Finally, divide the total volume by this base area (120÷24120 \div 24) to find the missing height, which is 55 feet.

Step-by-Step Solution

1
Identify the formula for the volume of a rectangular container.
V=L×W×HV = L \times W \times H
This standard formula relates the total volume to the object's three dimensions.
2
Substitute the given values into the formula.
120=6×4×H120 = 6 \times 4 \times H
We are given the total volume (120120), the length (66), and the width (44).
3
Calculate the area of the base by multiplying the length and the width.
6×4=246 \times 4 = 24
Simplifying the right side of the equation reduces it to a single multiplication step.
4
Solve for the height by dividing the total volume by the base area.
120÷24=5120 \div 24 = 5
Isolating HH provides the missing dimension.

Key Concept

Solving for a missing dimension of a rectangular prism using the volume formula.
Estimated Time:45s
Question 420Question →

A military transport vehicle has circular tires with a diameter of 44 feet. If the vehicle moves forward such that each tire makes exactly 250250 full revolutions without slipping, what is the total distance traveled in feet? Use π=3.14\pi = 3.14.

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Answer: 3140

Answer

3140
Each time a tire completes one full revolution, the vehicle moves forward a distance exactly equal to the tire's circumference. The circumference is found by multiplying the diameter (44 feet) by π\pi (3.143.14), yielding 12.5612.56 feet per revolution. Multiplying this linear distance by 250250 revolutions gives a total distance of 31403140 feet.

Step-by-Step Solution

1
Calculate the circumference of the tire.
12.56 feet
One full revolution of a tire covers a linear distance exactly equal to its circumference.
2
Calculate the total distance traveled by multiplying the circumference by the number of revolutions.
3140 feet
The total distance is the distance covered in one revolution multiplied by the total number of revolutions.

Key Concept

Circumference and Wheel Revolutions
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