If a clock set to Greenwich Mean Time or Universal Time is moved to a location where Noon, according to the sun, occurs at 4:30 P.M. clock time, what is the longitude of the clock?

Question

Quizplus · Accepted Answer

The clock shows a 4.5-hour difference from GMT, which means the location is 4.5 hours behind GMT. Since each hour represents 15 degrees of longitude (360 degrees/24 hours), a 4.5-hour difference equals 67.5 degrees. Because the time is behind GMT, the location is west of the Prime Meridian, making the correct answer 67.5°W.

If a Clock Set to Greenwich Mean Time or Universal