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    Two trains, each 250 m in length are running on parallel lines in opposite directions at speeds of 90 km/h and 60 km/h respectively. In how many secon
    Question

    Two trains, each 250 m in length are running on parallel lines in opposite directions at speeds of 90 km/h and 60 km/h respectively. In how many seconds will they cross each other completely?

    A.

    15 sec

    B.

    18 sec

    C.

    10 sec

    D.

    12 sec

    Correct option is D

    Given:
    Length of 1st Train =  Length of 2nd Train = 250 m
    Speed of 1st Train = 90 km/hr
    Speed of 2nd Train = 60 km/hr
    Formula Used:
    Distance = Speed × Time
    Solution:
    Relative Speed = (90 + 60) km/hr = 150 km/hr
    Convert into m/sec => (150×518)m/sec(150 × \frac 5{18}) m/sec​​
    The distance covered to pass each other = (250 + 250) m = 500 m
    So, the time taken to pass each other =500150×518\frac {500} {150 \times \frac{5}{18}} = 12 sec​

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