Question

Find the local time of a place whose longitude is 45° E, when GMT is 12 noon.

Answer 1

To find the local time of a place at 45° E longitude when GMT is 12 noon, we use the fact that every 1° longitude corresponds to 4 minutes of time difference. The difference in longitude from Greenwich (0°) to the place (45° E) is 45°. Multiplying 45° by 4 minutes gives 180 minutes, or 3 hours. Since the place is east of Greenwich, its local time is ahead of GMT by 3 hours. Therefore, when it is 12 noon GMT, the local time at 45° E longitude is 3 PM.