Question
A train running at 70 km/h passes a person riding
parallel to the railway line moving in the opposite direction in 2 seconds. If the rider goes in the same direction, the train takes 5 seconds to pass him. What is the speed of the rider?Solution
Suppose the speed of man 'x' km/h. Take length of man is negligible. So, the distance traveled by train to cross man from both opposite and same side will be equal. ATQ- (70+x) ×5/18 ×2 =(70-x) ×5/18×5 140+2x =350-5x 7x =210 X =30km/h.
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