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DUMET Medical DUMET Medical Solved Paper-2009

  • question_answer
    You drive a car at a speed of \[70\,\,km{{h}^{-1}}\] in a straight road for 8.4 km, and then the car runs out of petrol. You walk for 30 min to reach a petrol pump at a distance of 2 km. The average velocity from the beginning of your drive till you reach the petrol pump is

    A)  16.8 \[km{{h}^{-1}}\]     

    B)  35 \[km{{h}^{-1}}\]

    C)  64 \[km{{h}^{-1}}\]       

    D)  18.6 \[km{{h}^{-1}}\]

    Correct Answer: A

    Solution :

     Here, total distance \[=8.4+2=10.4\,km\] Time \[{{t}_{1}}=30\,\min =\frac{1}{2}\,h\] and \[{{t}_{2}}=\frac{8.4}{70}h\] \[\therefore \] Total time \[=\frac{1}{2}+\frac{8.4}{70}=0.12\,h\] Now, average velocity \[=\frac{total\text{ }distance}{total\text{ }time}\] \[=\frac{10.4}{0.62}=16.8\,\,km{{h}^{-1}}\]


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