a man walks at the speed of 4 kilometre per hour . a train coming from behind him at 22 kilometre per hour passes by him in 30 seconds .find the length of the train
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Speed of man = 4kmn
−1
Speed of train = 22kmn
−1
Relative speed of train w.r.t man
=22−4=18kmn
−1
Answer =
=
18
5
×18=5ms
−1
length of train =5×30=150m
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