If it is 12 noon in New Delhi, what will be the time in London, UK?
- A.6:30 A.M.
- B.6:30 P.M.
- C.5:30 A.M.
- D.5:30 P.M.
Correct answer
Explanation
The correct answer is A, 6:30 A.M. Indian Standard Time is 5 hours 30 minutes ahead of Greenwich Mean Time, so noon in New Delhi is 6:30 in the morning in London.
Indian Standard Time is based on the 82.5° E meridian, which passes near Mirzapur in Uttar Pradesh. The Earth turns 15° every hour, or 1° in 4 minutes, so 82.5° works out to 5 hours 30 minutes. London lies on the Prime Meridian (0°) at Greenwich, and places to the east see the sun earlier, so London's clock is behind India's. Subtracting 5:30 from 12:00 gives 6:30 A.M. During British Summer Time London moves its clocks one hour ahead, but the question uses standard time.
B is wrong because 6:30 P.M. would put London six and a half hours ahead of India, though London lies to the west. C is wrong because 5:30 A.M. would need a gap of six and a half hours. D is wrong because 5:30 P.M. comes from adding the 5 hours 30 minutes instead of subtracting them.
Exam tip: 15° = 1 hour, 1° = 4 minutes; IST at 82.5° E = GMT + 5:30; go east, add time; go west, subtract.
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