When there is noon at I.S.T. meridian people at another place of the earth are taking their 6 O’ clock morning tea. The longitude of the place is:
✓ Correct answer: b) 7°30’ W .
ExplanationOption (b) is correct : Indian Standard Time (I.S.T.) is based on the meridian 82°30’ E, which is the reference for I.S.T. If it is noon (12:00 PM) at I.S.T., and people at another place are having 6:00 AM morning tea, that means the time difference be- tween the two places is 6 hours.To calculate the longitude difference :A time difference of 1 hour corresponds to a 15° difference in longitude.Therefore, a 6-hour difference corresponds to a 90° difference in longitude (6 × 15°).Since the other place is 6 hours behind I.S.T., it must be 90° to the west of the I.S.T. meridian.I.S.T. The meridian is at 82°30’ E, so moving 90° to the west brings us to 7°30’ W. Thus, the place is at a longitude of 7°30’ W. 493
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