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    Question

    A boy runs 3 laps around a circular ground with a

    diameter of 28 m, traveling along its circumference at a speed of 36 km/h. Calculate the time he takes to complete the distance. [Use π = 22/7]
    A 26.4 seconds Correct Answer Incorrect Answer
    B 25 seconds Correct Answer Incorrect Answer
    C 24.2 seconds Correct Answer Incorrect Answer
    D 23.5 seconds Correct Answer Incorrect Answer

    Solution

    Radius = 28/2 = 14 m Speed of boy = 36 km/hr. = 36×5/18 = 10 m/s Circumference of the circle = 2 πr = 88 m Distance covered in 3 rounds = 3×88 = 264 m Time taken = 264/10 = 26.4 seconds

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