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Question

A ship sailing from the eastern extremity of the Aleutian Islands to Dutch crosses 180° meridian at 23.30 hrs on January 1, 1999. What time and date will be recorded by the captain of the ship in his diary after one-hour journey from the point of crossing of the meridian?

A
January 1, 0030 hrs
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B
January 2, 0030 hrs
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C
January 3, 0030 hrs
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D
January 4, 0030 hrs
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Solution

The correct option is B January 2, 0030 hrs


The Earth takes 24 hours to complete one rotation or to cover 360°of longitudes. This means that the Earth covers 15° of longitudes every hour. Thus, one degree of longitude takes 4 minutes (1 hour = 60 minutes, divided by 15° per hour = 4 minutes per longitude).

Time will be recorded by captain = 23:30 hrs+1 hr=00:30hrs

Time and date will be recorded by the captain of the ship in his diary after one-hour journey from the point of crossing of the meridian will be January 2, 00:30hrs.


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