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Question
Calculate the time at Durban (longitude 30°E) when the time is 7.00 a.m. at New York (75°W).
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Solution
The longitudinal difference between Durban and New York is 30° + 75° = 105°, so the time will be 105 × 4 = 420 minutes ahead from New York. There is a difference of 420 minutes or 7 hours, or 2 p.m.
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