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6th Class Mathematics Related to Competitive Exam Question Bank Distance, Time and Speed

  • question_answer
    A car covers a certain distance travelling at a speed of 60 kmph and returns to the starting point at a speed of 40 kmph. Find the average speed for the entire journey.

    A) 48 kmph          

    B)          54 kmph

    C) 72 kmph          

    D)          94 kmph

    Correct Answer: A

    Solution :

        We know that the average speed is \[\frac{2pq}{p+q},\] where p and q are the speeds in the two directions, for equal distances. \[\therefore \] Average speed \[=\frac{2(60)(40)}{(60+40)}\,=48\,kmph\]


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