On a topographical map with a constant contour interval of 20\text{ m}, Point X is located… — JAMB UTME

On a topographical map with a constant contour interval of $20\text{ m}$ , Point X is located on the contour line labeled $240\text{ m}$ . Point Y is located higher up the same hill, exactly three contour intervals above Point X. What is the elevation of Point Y in meters?

Answer: 300 m

Answer

The elevation of Point Y is

300\text{ m}

The contour interval indicates that consecutive contour lines differ by

20\text{ m}

in elevation. Moving up three contour line intervals from Point X (

240\text{ m}

) increases elevation by

3 \times 20\text{ m} = 60\text{ m}

. Thus, the elevation at Point Y is

240\text{ m} + 60\text{ m} = 300\text{ m}

Step-by-Step Solution

Calculate total vertical rise between the two points

Vertical rise =

3 \times 20\text{ m} = 60\text{ m}

Point Y is three contour intervals higher than Point X, and each interval represents

20\text{ m}

of vertical distance.

Calculate the elevation at Point Y

Elevation at Point Y =

240\text{ m} + 60\text{ m} = 300\text{ m}

Adding the total vertical rise to the baseline elevation at Point X yields the final elevation at Point Y.

Key Concept

Calculating elevation on topographical maps using contour intervals

Estimated Time:45s

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