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NTSE Sample Paper NTSE SAT Practice Test-18

  • question_answer
    The distance between two stations A and B is 778 km. A train covers the journey from A to B at 84 km p.h. and returns back to A with the uniform speed of 56 km. p.h. The average speed for the whole journey is

    A) 70kmph            

    B)        76kmph

    C) 69.2 kmph        

    D) 67.2 kmph

    Correct Answer: D

    Solution :

    [d] Required average speed \[=\left( \frac{2xy}{x+y} \right)\] km.p.h.                        \[=\frac{2\times 84\times 56}{(84+56)}\] km.p.h = 67.2 km.p.h.


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