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    A truck travels at a speed of 60 km/h from city P to city Q and returns to city P by the same route at a speed of 100 km/h. What is the average speed
    Question

    A truck travels at a speed of 60 km/h from city P to city Q and returns to city P by the same route at a speed of 100 km/h. What is the average speed of the truck for the given journey?

    A.

    80 km/h

    B.

    85 km/h

    C.

    70 km/h

    D.

    75 km/h

    Correct option is D

    Given:

    The speed of truck P to Q = 60 km/h 

    The speed of truck Q to P = 100 km/h 

    Formula Used:

    Average speed = 2v1v2v1+v2\frac{2v_1v_2}{v_1 +v_2} 

    Solution:

    = 2×60×10060+100\frac{2\times60\times100}{60+100} 

                          = 75 km/h 

    ​

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