When there is noon at IST meridian, people in another place of the Earth are taking their 6 O' clock morning tea. The longitude of the place is ______.
A
7o30′′E
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B
7o30′′W
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C
172o30′′E
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D
90oW
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Solution
The correct option is A7o30′′W If the time of the concerned place is 6 hours behind Indian Standard Time (IST), which itself is 5.5 hours ahead of Greenwich Mean Time (GMT), it means that it is located to the west of Prime Meridian, i.e. 0 degrees meridian. A difference of 15 degrees in longitude represents 1 hour of difference. This means that the given location is located 7.5 (15 divided by 2) degrees west of the Prime Meridian, i.e 7 degrees and 30 minutes W.