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9th Class Mathematics Related to Competitive Exam Question Bank Arithmetic

  • question_answer
    For a man covering a certain distance at 6 km/hr and returning at 4 km/hr. The average speed of the man is

    A)  1.2 km/hr       

    B)         2.4 km/hr

    C)  3.6 km/hr       

    D)         4.8 km/hr  

    Correct Answer: D

    Solution :

                    Given\[,\]           \[u=6\,\,km/hr\].                                 \[v=4\,\,km/hr\]. Average speed      \[=\frac{2uv}{(u+v)}=\frac{2\times 6\times 4}{(6+4)}\]                                   \[=\frac{48}{10}\]                                  \[=4.8\]km/hr.


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