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Difficulty: EasyThe Earth as a Planet and Earth Movements

Town X is located on longitude 15∘E15^\circ\text{E}. If the local time at the Greenwich Meridian (0∘0^\circ) is 12:00 noon, what is the local time at Town X?

  1. 1:00 pmAnswer
  2. B
    11:00 am
  3. C
    12:15 pm
  4. D
    2:00 pm

Answer

The local time at Town X is 1:00 pm.
Earth rotates 360∘360^\circ in 24 hours, which means 15∘15^\circ equals 1 hour. Because Town X is located at 15∘E15^\circ\text{E}, it is ahead of Greenwich (0∘0^\circ) by 1 hour. Adding 1 hour to 12:00 noon gives 1:00 pm.

Step-by-Step Solution

1
Calculate the longitudinal difference between Greenwich Meridian (0∘0^\circ) and Town X (15∘E15^\circ\text{E}).
15∘−0∘=15∘15^\circ - 0^\circ = 15^\circ.
The rate of Earth's rotation is 15∘15^\circ per hour (360∘/24 hours=15∘/hour360^\circ / 24\text{ hours} = 15^\circ/\text{hour}).
2
Convert the longitudinal difference into time difference.
15∘÷15∘/hour=1 hour15^\circ \div 15^\circ/\text{hour} = 1\text{ hour}.
Every 15∘15^\circ of longitude corresponds to a time difference of 11 hour.
3
Determine whether to add or subtract time based on direction relative to GMT.
12:00 noon + 1 hour = 1:00 pm.
Places located East of the Greenwich Meridian are ahead in time ('East gain, West lose').

Key Concept

Local time calculation using longitude differences and Earth rotation rate
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Topics

The Earth as a Planet and Earth Movements

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