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      Question

      Train 'A' having a speed of 18 m/s can cross a man in 10

      seconds. The length of train 'B' is 72 metres more than the length of 'A'. If the speed of 'B' is 42 m/sec and both trains are travelling towards each other, then find the time taken by them to cross each other.
      A 6.2 seconds Correct Answer Incorrect Answer
      B 6.7 seconds Correct Answer Incorrect Answer
      C 7.2 seconds Correct Answer Incorrect Answer
      D 7.7 seconds Correct Answer Incorrect Answer

      Solution

      Length of train 'A' = 18 Ă— 10 = 180 metres
      Length of train 'B' = 180 + 72 = 252 metres
      Relative speed = 18 + 42 = 60 m/sec
      Required time = (180 + 252) Ă· 60 = 432 Ă· 60 = 7.2 seconds

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