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  1. Two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speeds is:
    2. A.

    1 : 3
    B.

    3 : 2
    C.

    3 : 4
    D.

    none of these

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    Answer : Option B

    Explanation :

    Let the speeds of the two trains be x m/sec and y m/sec respectively.

     

    Then, length of the first train = 27x metres,

     

    and length of the second train = 17y metres.

     

     \( \frac { 27 X + 17 Y } {X +Y }\)   = 23
     

     

     27x + 17y = 23x + 23y

     

     4x = 6y

     

    \( \frac { X } { Y } \)= \(\frac {3 } { 2 } \)

     

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