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 2Ï€R cos4^o
• B Ï€R sin40^o
• C Ï€R/2 cos4^o
• D Ï€R/3 cos4^o
• E Ï€R/6 cos4^o