Two towns, P and Q, are on (4^oN 40^oW) and (4^oN
20^oE) respectively. What is the distance between
them, along their line of latitude? (Give your
answer in teems of π and R, the radius of the earth).

A. 2πR cos4^o
B. πR sin40^o
C. πR/2 cos4^o
D. πR/3 cos4^o  
E. πR/6 cos4^o

Show Answer Show Explanation

Correct Answer: D