Find the distance between two towns P(45°N, 30°W) and Q(15°S, 30°W) if the radius of the earth is 7000km. [(pi = frac{22}{7})]

A.
(frac{1100}{3})km 
B.
(frac{2200}{3})km 
C.
(frac{22000}{3})km 
D.
(frac{1100}{3})km
Correct Answer: Option C
Explanation
Angular difference = 45° + 15° = 60°.
(D = frac{60°}{360°} times 2 times frac{22}{7} times 7000)
= (frac{22000}{3} km)