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      Question

      Two trains of lengths 100 m and 90 m are running with

      speeds of 60 km/hr and 57 km/hr respectively towards each other on parallel lines. If they are 70 m apart, after how many seconds they will cross each other?
      A 5.6 sec Correct Answer Incorrect Answer
      B 7.2 sec Correct Answer Incorrect Answer
      C 8 sec Correct Answer Incorrect Answer
      D 9 sec Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Relative speed = (60 + 57) km/hr. = 117 km/hr. => 117 × (5/18) m/sec = 65/2 m/sec Distance covered = 100 + 90 + 70 = 260 m Required time = 260 × (2/65) = 8 sec

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