The Position of two A and B on the earth’s surface are (36°N, 49°E) and (360°N, 131°W ) respectively.

Question

(a) The difference in long between town A and town
(b) Given that the radius of the earth is 6370, calculate the distance town A and town B.
(c) Another town, C is 840 east of town B and on the same latitude as towns A and B. Find the longitude C.

Answer 1

I assume you meant both points to be at 36°N. They are 180° apart in longitude.

A good discussion on the topic can be found at

http://www.movable-type.co.uk/scripts/gis-faq-5.1.html

or any number of other hits by google.