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Two trains 105 meters and 90 meters long, run at the speeds of 45 km/h and 72 km/h respectively , in opposite directions on parallel tracks. The time which they take to cross each other , is :

Two trains 105 meters and 90 meters long, run at the speeds of 45 km/h and 72 km/h respectively , in opposite directions on parallel tracks. The time which they take to cross each other , is : Correct Answer 6 seconds

Length of the 1st train = 105 m Length of the 2nd train = 90 m Relative speed of the trains, = 45 + 72 = 117 kmph = (117 × 5)/18 = 32.5 m/sec Time taken to cross each other, = (Length of 1st train + length of 2nd train)/ relative speed of the trains ∴ Time taken = 195/32.5 = 6 secs.

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