Two trains one is of 121 m in length at the speed of 40 km hour and the other is of 99 m in length a...........

Quantitative Aptitude (CDS) Problems on trains

Two trains, one is of 121 m in length at the speed of 40 km/ hour and the other is of 99 m in length at the speed of 32 km/ hour are running in opposite

directions. In how much time will they be completely clear from each other from the moment they meet?

10sec

11sec

16sec

21sec

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Explanation:

Speed of 1st train = 40 km/h
Speed of 2nd train = 32 km/h
Relative speed of trains=40+32=72km/h=72*5/18=20m/s
Total length of both the trains = 121 + 99 = 220 m
Time required =220/20= 11 sec