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Chhattisgarh PMT Chhattisgarh PMT Solved Paper-2011

  • question_answer
    One car moving on a straight road covers one-third of the distance with 20 km/h and the rest with 60 km/h. The average speed is

    A)  40 km/h                             

    B)  80 km/h

    C)  46 2 km/h                           

    D)  36 km/h

    Correct Answer: D

    Solution :

    Let total distance \[=x\] Average speed \[=\frac{\text{total}\,\text{distance}}{\text{total time}}\]                 \[=\frac{x}{\frac{x}{3\times 20}+\frac{2x}{3\times 60}}\]                 \[=\frac{180\times x}{5x}=36km/h\]


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