If the local time at Lagos (longitude 3°E) is 1:00 p.m., what is the Greenwich Mean Time (GMT) at the same instant?
A12:48 p.m.CORRECT
B1:12 p.m.
C1:00 p.m.
D12:00 p.m.
GCEGeographyEarth and Solar System2024
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Why the answer is A, and why the others tempt you.
Lagos is at 3°E, so it is east of Greenwich and therefore ahead of GMT. The time difference is 3° × 4 minutes/degree = 12 minutes. GMT is therefore 12 minutes behind Lagos time: 1:00 p.m. − 12 minutes = 12:48 p.m. This reflects the principle that places east of Greenwich keep times ahead of GMT.
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