If it is 10:00 a.m. at Greenwich Mean Time (GMT), then what will be the time at 90^\circ E longitude?

  1. A. 5:00 a.m.
  2. B. 4:00 a.m.
  3. C. 3:00 p.m.
  4. D. 4:00 p.m.

Correct Answer: D. 4:00 p.m.

Explanation

The earth rotates 15^\circ per hour. 90^\circ E is 90 / 15 = 6 hours ahead of GMT. 10:00 a.m. + 6 hours = 4:00 p.m.

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