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NTSE Sample Paper NTSE SAT Practice Test-14

  • question_answer
    A boy walks to his school at a distance of  6 km with constant speed of 2.5  km/h and walks back with a constant speed of 4 km/h. His average speed for round trip expressed in km/h, is given as                    

    A) \[\frac{24}{13}\]                                   

    B) \[\frac{40}{13}\]

    C)  3                                

    D) \[\frac{1}{2}\]

    Correct Answer: B

    Solution :

    [b] Total time (T) \[=\frac{6}{2.5}+\frac{6}{4}\] \[=\frac{12}{5}+\frac{3}{2}=\frac{39}{10}\,\,h\] Average speed (V) \[=\frac{6+6}{39/10}=\frac{120}{39}\] \[=\frac{40}{13}\] km/h


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