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24-05-2021 Problems on Trains

Q. A train overtakes two persons who are walking in the same direction in which the train is going, at the rate of 2 kmph and 4 kmph and passes them completely in 9 and 10 seconds respectively. The length of the train is:

A. 45 m
B. 50 m
C. 54 m
D. 72 m

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Nasreen Laskar
Commented on 2021-05-24 22:25:36 (IST)
Ans: (B)
Let, speed of train=x km/h
=> X=22 km/h

Hence, length of train
=(x-2)*9/3600 km
=20*9/3600 km
=1/20 km
=1000/20 m
=50 m