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    Question

    A person covers a certain distance by car, driving at the speed of 90 kmph and returns back to the starting point, riding on a bike at the speed of 60 kmph. What is his average speed for the whole journey?

    A 76km/hr Correct Answer Incorrect Answer
    B 75km/hr Correct Answer Incorrect Answer
    C 72km/hr Correct Answer Incorrect Answer
    D 73km/hr Correct Answer Incorrect Answer
    E none of these Correct Answer Incorrect Answer

    Solution

    Average speed = 2xy/(x+y) = (2 × 60 × 90)/(90+60) = 72 km / hr.

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