A car drives 10km with a speed of 72 km/hr and then runs out of gas. Then you walk 2km for the next 30 min until you find a gas statio

Question

A car drives 10km with a speed of 72 km/hr and then runs out of gas. Then you walk 2km for the next 30 min
until you find a gas station.

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Vân Khánh 2 months 2021-07-25T17:11:52+00:00 1 Answers 18 views 0

Answers ( )

    0
    2021-07-25T17:13:01+00:00

    Given :

    A car drives 10 km with a speed of 72 km/hr and then runs out of gas.

    Then you walk 2 km for the next 30 min  until you find a gas station .

    To Find :

    The average speed of whole journey .

    Solution :

    Average speed is given by :

    v_{avg}=\dfrac{\text{Total distance covered}}{\text{Total time taken}}\\\\v_{avg}=\dfrac{10+2}{\dfrac{10}{72}+\dfrac{1}{2}}\\\\\\v_{avg}=18.78\ km/hr

    Hence , this is the required solution .

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