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ICSE Class 9 Geography Question 21 of 22

Geographic Grid: Latitudes and Longitudes — Question 1

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Question 1

An important programme was to be broadcast from Mumbai at 7:30 p.m. This was heard by some Indian sailors near Ivory Coast in West Africa at 20°W longitude. What was the local time there?

Answer

The local time at Mumbai is 7:30 pm.
The location of Mumbai is 82 1/2° E of Prime Meridian.
The GMT would be 9:20 a.m. [7:30 hrs - (82 1/2°x 4 min) = 7:30 hrs - 5:30 hrs = 2:00 pm.
Ivory Coast is located at 20° W of Prime Meridian.
At any point of time, Ivory Coast will be 20 X 4 = 80 min = 1:20 hrs behind GMT.
So, when it is 2:00 pm at GMT, the local time at Ivory Coast will be 2:00 - 1:20 = 12:40 pm.