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      Question

      Train 'A' having a speed of 20 m/s can cross a man in 6

      seconds. The length of train 'B' is 40 metres more than the length of 'A'. If the speed of 'B' is 30 m/sec and both trains are travelling towards each other, then find the time taken by them to cross each other.
      A 4.6 seconds Correct Answer Incorrect Answer
      B 5.1 seconds Correct Answer Incorrect Answer
      C 5.6 seconds Correct Answer Incorrect Answer
      D 6.1 seconds Correct Answer Incorrect Answer

      Solution

      Length of train 'A' = 20 ├Ч 6 = 120 metres
      Length of train 'B' = 120 + 40 = 160 metres
      Relative speed = 20 + 30 = 50 m/sec
      Required time = (120 + 160) ├╖ 50 = 280 ├╖ 50 = 5.6 seconds

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