Two trains 140 m and 160 m long run at the speed of 60 km h and 40 km h respectively in opposite dir...........

Quantitative Aptitude (CDS) Problems on trains

Two trains 140 m and 160 m long run at the speed of 60 km/h and 40 km/h respectively in opposite directions on parallel tracks. The time (in seconds) which they cross each other, is?

9.6

10.8

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Explanation:

Relative speed= (60+40) km/s
=[100×(5/18)] m/s
=(250/9) m/s
Distance covered in crossing each other = (140+160) m =300m
Required time=[300×(9/250)]s
=(54/5) s
=10.8 s