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Question
Arun called his mother from Digboi at 7 am. At what local time will his mother pick up his call at Jaisalmer?
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Solution
Arun called his mother from Digboi (95° E) at 7:00 AM. Jaisalmer (70° E) is 25° west of Digboi. Since the Earth takes 4 minutes to rotate 1°, the time difference between the two places is 25 × 4 = 100 minutes, i.e., 1 hour 40 minutes.
Digboi is ahead of Jaisalmer in time, so Jaisalmer’s local time will be 1 hour 40 minutes behind.
Therefore, his mother in Jaisalmer will receive the call at 5:20 AM local time.
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