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    Question

    Two trains of lengths 180 m and 120 m are running on

    parallel tracks in opposite directions at speeds of 54 km/h and 36 km/h respectively. How much time will they take to completely cross each other?
    A 18 secs Correct Answer Incorrect Answer
    B 12 secs Correct Answer Incorrect Answer
    C 10 secs Correct Answer Incorrect Answer
    D 20 secs Correct Answer Incorrect Answer

    Solution

    ATQ, Speed of first train = 54 km/h = 54 × (5/18) = 15 m/s Speed of second train = 36 km/h = 36 × (5/18) = 10 m/s Relative speed (opposite directions) = 15 + 10 = 25 m/s Total distance to cross each other = sum of lengths = 180 + 120 = 300 m Time = Distance / Speed = 300 / 25 = 12 s

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