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Q.

A 100m long train crosses a man travelling at 5km/h in opposite direction, in 7.2 s then the velocity of train is 

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a

25 km/h

b

20 km/h

c

45 km/h

d

40 km/h

answer is D.

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Detailed Solution

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Relative velocity of the train with respect to man is  is v+5

 72=100(v+5)(5/18)  Or    v=45km/h

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A 100m long train crosses a man travelling at 5km/h in opposite direction, in 7.2 s then the velocity of train is