Math
posted by Bee
A topographic quadrangle is a 30' series map (it covers 30' longitude and latitude). If the western longitude boundary is 120 degrees 02 feet 30 inches, what is the longitude of the eastern boundary?

Ms. Sue
That depends upon which hemisphere the map depicts  Eastern or Western?

Bee
It doesn't specify. Can you tell me the answer to both?

Ms. Sue
Don't you mean, 120 degrees, 2 minutes, 30 seconds?
http://en.wikipedia.org/wiki/Latitude
In the Western Hemisphere, the longitude numbers get larger as you go west. So 120 degrees, 02 minutes, 30 seconds minus 30 degrees equals 90 degrees, 02' 30".
In the Eastern Hemisphere add 30 degrees to the boundary longitude. 
Bee
Thank you.
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