If it is 10:00 a.m. at Greenwich Mean Time (GMT), then what will be the time at 90^\circ E longitude?
- A. 5:00 a.m.
- B. 4:00 a.m.
- C. 3:00 p.m.
- 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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