If it is 9pm at the Prime Meridian 0 degrees, what time is it at 75 degrees?

If the time is 9pm at the Prime Meridian which is 0°, the time at 75°W will be 4pm.

Going by degrees of longitude, every 15° is an hour. 75° will therefore be:

= 75 / 15

= 5 hours

When counting time, we start from the Prime Meridian. If the line of longitude is to the east of the Prime Meridian, you add the hours because those areas are ahead of the Prime Meridian.

If it is to the west, you subtract the hours because those areas are behind. The area in the question is west so we subtract the 5 hours from 9 pm:

= 9 - 5

= 4 pm

In conclusion, the time at 75°W is 4pm when the Prime Meridian time is 9pm.

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2 AM

Explanation:

The answer is 02:00 (or 2 a.m.)

A circle has 360 degrees. A day has 24 hours. This means that between every hour there are 360/24 = 15 degrees. And 75 divided by 15 is 5. The time goes from east (E) to west (W). This means that if the time is 9pm at 0 degrees, then the time must be 5 hours later at 75 degrees E., which is 02:00 hrs