If it is 10:00 PM on July 3rd at 30° west,what date and time is it at 15° east?
A)July 3rd;11 P.M.
B)July 3rd;9 P.M.
C)July 3rd;6 P.M.
D)July 4th;1 A.M.
E)July 4th;2 A.M.

Question

Quizplus · Accepted Answer

To solve this problem, we need to know that the Earth is divided into 24 time zones, each one spanning 15 degrees of longitude. Moving eastwards from 30° west to 15° east means we're moving across 45 degrees of longitude, or 3 time zones (since each time zone is 15 degrees wide).

Since it's 10:00 PM on July 3rd at 30° west, the time at 15° east will be 1 hour later for each time zone we cross. So we add 3 hours to 10:00 PM, giving us 1:00 AM on July 4th.

Therefore, the answer is D) July 4th; 1 A.M.

If It Is 10:00 PM on July 3rd at 30°