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Two parallel rail tracks run north-south. Train A moves north with a speed of 54 km/h and train B moves south with a speed of 90 km/hr. What is the velocity of a monkey running on the roof of the train A against its motion (with its velocity of 18 km/h with respect to the train A) as observed by a man standing on the ground?

A

36 km/hr - North

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B

36 km/hr - South

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C

72 km/hr - North

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D

72 km/hr - South

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Solution

The correct option is A
36 km/hr - North

$\to v m o n k e y g r o u n d = ? {\to v}_{m g} = {\to v}_{m A} + {\to v}_{A g} = 18 - 54 = - 36 k m / h r$
Hence velocity of monkey will be 36 km/hr towards north.

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