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    Question

    Two trains P and Q of lengths 320 m and 540 m,

    respectively, are running in the same direction on parallel tracks at 108 km/h and 144 km/h, respectively. How much time will the trains take to cross each other completely?
    A 86 s Correct Answer Incorrect Answer
    B 54 s Correct Answer Incorrect Answer
    C 32 s Correct Answer Incorrect Answer
    D 68 s Correct Answer Incorrect Answer

    Solution

    Length of train P =320m and train Q=540m. Total distance =540+320=860m Speed of trains P and Q =108 km/h and 144 km/h. Speed of trains when are running in same direction=144-108=36km/h =36×5/18=10m/sec. Now time =860/10 =86sec. =86sec.

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