What time will it be at 105W if it is 10pm, at 45W?

Since there are 24 hours in a day and 360 degrees in a circle, the sun moves across the sky at a rate of 15 degrees per hour (360° ÷ 24 hours = 15° per hour).To cover a distance of 1° (i.e., per longitude), the sun will take (60 ÷ 15 =) 4 minutes. Thus, the time difference per longitude is 4 minutes. Thus, the time difference per longitude is 4 minutes.Now, between A and B, the number of longitudes is (90 - 15 =) 75. Thus, the time to cover 75 longitudes is (75 x 4 =) 300 minutes or (300 ÷ 60 =) 5 hours. Now, since B (at 90W) is to the west of A (at 15W), time-wise, A is ahead of B, by 5 hours. So, if at A, the local time is 7 AM, the local time at B is (7 – 5 =) 2 AM.

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