Question

If it is 5:30pm at 120°W, what time is it at the Prime Meridian?
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Answer 1

There is a time difference of 1 hour for every 15 degree of longitude. So if we divide 120 with 15 we get 8 hours . So if it is 5:30pm at 120 west you have to add 8 hours as it will have time ahead of prime meridian. So at prime meridian it will 1:30 am.

Hope this helped