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WAEC SSCE - Geography - 1990 (Objective)

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What is the longitude of a place X whose time is noon when Greenwich meantime is 6p.m?
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The earth rotates 360 degrees in 24 hours, which means that it rotates 15 degrees per hour. The time difference between Greenwich meantime and Place X is 6 hours. Therefore, the difference in longitude between Greenwich and Place X is 6 x 15 = 90 degrees. Since the time at Place X is 12 pm (noon), we know that it is halfway between sunrise and sunset, which means that it is roughly at the meridian line of that location. Therefore, we can calculate the longitude of Place X by adding or subtracting half of the 360-degree circumference of the earth from the longitude of the Greenwich meridian (which is 0 degrees). Since the time difference between Greenwich and Place X is westward (Greenwich time is ahead of Place X time), we need to subtract 90 degrees from the Greenwich meridian to get the longitude of Place X, which is 90 degrees west, or 90°W. Therefore, the correct answer is option (E) 90°W.
Lees lesnotitie op Physical Geography (JAMB)
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