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    Two trains, 145 m and 155 m in length, run on parallel tracks. One train runs at the speed of 32 km/h and the other at 40 km/h. When both trains run i
    Question

    Two trains, 145 m and 155 m in length, run on parallel tracks. One train runs at the speed of 32 km/h and the other at 40 km/h. When both trains run in opposite direction, then the time required for them to cross each other completely from the moment they meet is:

    A.

    15 sec

    B.

    10 sec

    C.

    12 sec

    D.

    20 sec

    Correct option is A

    Given:

    Lengths of trains: 145 m and 155 m

    Speeds: 32 km/h and 40 km/h

    Direction: Opposite

    Need to find time to cross each other completely.

    Formula Used:

    Time =Sum of lengthsRelative speed= \frac{\text{Sum of lengths}}{\text{Relative speed}}

    Solution:

    Total length = 145 + 155 = 300 m

    Relative speed = 32 + 40 = 72 km/h

    Now,

    Time =30072×518=30020 m/s=15 seconds\frac{300}{72 \times \frac{5}{18} } = \frac{300}{20 \text{ m/s}} = 15 \text{ seconds}​ 

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