An airplane pilot sets a compass course due west and maintains an air speed of 240 km/h. After flying for 
h, he finds himself over a town that is 150 km west and 40 km south of his starting point. The wind velocity (with respect to ground) is :
Text Solution
Verified by ExpertsThe correct answer is:
A
100 km/h, 37° W of S
Sol. Let velocity of wind be
(240 + v 1 ) 1/2 = 150 ⇒ v 1 = 60
and v 2 × 1/2 = 40 ⇒ v 2 = 80
so v air = 
= 100 km/hr
tan θ = 
θ = 37º west of south
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