Two parallel rail tracks run north-south. Train A moves towards north with a speed of 54km/h and train B moves south with a speed of 90km/h. What is the:
a) velocity of B with respect to A?
b) Velocity of ground with respect to B?
c) Velocity of a monkey running on the roof of the train A against its motion (with a speed of 10km/h with respect to train A) as observed by a man standing on the ground?
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