Multiple Choice Questions on Mary jogs 9 km at a speed of 6 km per hour At what speed would she need to jog during the next........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

Mary jogs 9 km at a speed of 6 km per hour At what speed would she need to jog during the next...........

Quantitative Aptitude ( CCS) Time & distance
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     Mary jogs 9 km at a speed of 6 km per hour. At what speed would she need to jog during the next 1.5 hours to have an average of 9 km per hour for the entire jogging session ?

    9 kmph

    Incorrect Answer

    10 kmph

    Incorrect Answer

    12 kmph

    Correct Answer

    14 kmph

    Incorrect Answer
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    Explanation:

    Let speed of jogging be x km / hr.

    Total time taken = (9/6 hrs + 1.5 hrs)= 3 hrs.

    Total distance covered = (9 + 1.5x) km.

    <=> (9 + 1.5x) / 3 = 9
    <=> (9 + 1.5x) = 27
    <=> x = 12 kmph

    By: Deepak Dawra
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