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) Time & distance

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?

10 sec

11 sec

16 sec

21 sec

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Explanation:

Speed of 1st train = 40 ×5/18=200/18m/sec
Speed of 2nd train = 32 ×5/18=160/18m/sec
Relative speed of trains=200/18+160/18=360/18
= 20 m/sec
Total length of both the trains = 121 + 99 = 220 m
Time required =220/20= 11 sec