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    Question

    A train goes from one place to another place at a speed

    of 60 km/hr. At what speed should it return to have an average speed of 48 km/hr?
    A 50 km/hr Correct Answer Incorrect Answer
    B 60 km/hr Correct Answer Incorrect Answer
    C 40 km/hr Correct Answer Incorrect Answer
    D 55 km/hr Correct Answer Incorrect Answer

    Solution

    ATQ,

    Given: Going speed = 60 km/h Average speed = 48 km/h Let return speed = x km/h Use formula:

    48(60+x) = 120x 2880 + 48x = 120x 2880 = 72x x = 40

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