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Discussion :: Time and Distance

  1. The ratio between the speeds of two trains is 7 : 8. If the second train runs 400 km in 4 hours, then the speed of the first train is:
    2. A.

    70 km/hr
    B.

    75 km/hr
    C.

    84 km/hr
    D.

    87.5 km/hr

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    Answer : Option D

    Explanation :

    Let the speed of two trains be 7x and 8x km/hr.

     

     Then 8X=\([\frac { 400} { 4 }]=100\)

     

     x =\([\frac { 100} { 8 }]=12.5\)

     

     Speed of first train = (7 x 12.5) km/hr = 87.5 km/hr.

     

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