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Discussion :: Problems on Trains

  1. A train 108 m long moving at a speed of 50 km/hr crosses a train 112 m long coming from opposite direction in 6 seconds. The speed of the second train is:

    2. A.

    48 km/hr
    B.

    54 km/hr
    C.

    66 km/hr
    D.

    82 km/hr

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    Answer : Option D

    Explanation :

    Let the speed of the second train be x km/hr.

     

    Relative speed = (x + 50) km/hr
      = \(\left(( { x +50 } ) \times(\frac{5}{18})\right)m/sec\)
      = \(\left(\frac{250+5x}{18}\right)m/sec\)

    Distance covered = (108 + 112) = 220 m.

     

    Therefore\(\frac{220}{\left(\frac{250+5x}{18}\right)}=6\)


     250 + 5x = 660

     

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