1.

Two parallel rail tracks run north-south. Train Amoves north with a speed of 54 kmh-1and trainB moves south with a speed of 90 km h-1. Whatis the (a) relative velocity of B with respect to A?(b) relative velocity of ground with respect to B ?and(c) velocity of a monkey running on the roof of thetrain A against the motion (with a velocity of18 km h1with respect to the train A as observedby a man standing on the ground?

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