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).

2πR cos4^o

πR sin40^o

πR/2

cos4^o

πR/3

cos4^o

πR/6

cos4^o

Correct answer is D

Angular distance = 40^o + 20^o = 60^o
using ^θ/₃₆₀ x 2πr for distance between p and Q
= ⁶⁰/₃₆₀ x 2πRcos4^o = ¹/₃πRcos4^o

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Two towns, P and Q, are on (4oN 40oW) and (4oN 20oE) 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).