Find the Longitude of town Y whose time is 8:00am when the time of another town X (long 30 E) is 12:00pm the same day.

Answer 1

each hour covers 15 degrees
Y is 4 hours west of X, so that would make its longitude 30°W

Answer 2

24 hours is 360 degrees so 360/24 = 15 degrees / hour
it is noon, 12 pm, at 30 east
we are 4 hours earlier so 4*15 = 60 degrees west of X (the sun meanders from east to west)
that would put us 30 degrees West Longitude, swimming in the Atlantic.

Answer 3

Thanks