SSC Government Jobs Exams Numerical Ability Time Distance and Speed

a man is sitting in 180 m long train and count 21 poles in 40 secs which are 50m apart. fond the speed of train.

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25 m/s.

Irrespective of the length of the train, a man sitting in a train will cross the distance of 21 poles(=20*50=1000m.) in 40 sec. with the speed of train.
So the speed of train=1000m/40s= 25m/s.
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