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Railways Quantitative Aptitude Speed, Time and Distance Question Bank Time, Speed and distance Sample Test Paper-12

  • question_answer
    An increase in the speed of car by 10 km per hour saves 1 hour in a journey of 200 km, find the initial speed of the car.

    A)  20 km/h           

    B)  30 km/h

    C)  36 km/h           

    D)  40 km/h

    Correct Answer: D

    Solution :

    [d] Let initial speed = x km/hr. \[\therefore \] \[\frac{200}{x}-\frac{200}{x+10}=1\] \[x(x+10)=2000\] \[{{x}^{2}}+10x-2000=0\] x = 40 km/h \[\therefore \] Initial speed of car = 40 km/h.


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