If it is 10:00 A.M. EST in Washington, D.C., what is the time in San Diego, California, the longitude of which is 45° more westerly?
A) 1:00 P.M. PST
B) 7:00 A.M. PST
C) 10:00 A.M. PST
D) 9:00 A.M. PST

Question

Quizplus · Accepted Answer

The Earth is divided into 24 time zones, each 15° of longitude apart, corresponding to one hour difference in time. Since San Diego is 45° more westerly than Washington, D.C., it is three time zones behind. Therefore, if it is 10:00 A.M. EST in Washington, D.C., it is 7:00 A.M. PST in San Diego.

If It Is 10:00 A