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    Question

    A giant circular wheel has a diameter of 63 metres. In

    how many revolutions will the wheel cover a total of 79.2 km?
    A 400 Correct Answer Incorrect Answer
    B 420 Correct Answer Incorrect Answer
    C 430 Correct Answer Incorrect Answer
    D 450 Correct Answer Incorrect Answer

    Solution

    Radius of the giant wheel = 63 ÷ 2 = 31.5 metres Circumference of the giant wheel = 2 × π × radius = 2 × (22/7) × 31.5 = 198 metres So, number of rotations to cover 79.2 km i.e. 79200 metres = 79200 ÷ 198 = 400

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