A train is moving forward with a velocity 35km/h. A man is walking backward with a velocity 7km/h. What is the velocity of man for an observer in the platform.
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A train is running at a speed of 45 km/hr and a man is walking at a speed of 5 km/hr in the opposite direction. If the train crosses the man in 18 seconds then what is its length ?
answer:250 m
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