Two trains 100 meters and 120 meters long are running in the same direction with speeds of 72 kmph a...........

Quantitative Aptitude (CDS) Problems on trains

Two trains 100 meters and 120 meters long are running in the same direction with speeds of 72 kmph and 54 kmph. In how much time will the first train cross the second?

37sec

49sec

52sec

44sec

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Explanation:

Relative speed of the trains = 72-54 kmph = 18 kmph
= 18×5/18 m/sec = 5 m/sec
time taken by the trains to cross each other
= time taken to cover (100+120)m at 5 m/sec
= 220/5 sec
= 44sec.