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    Question

    A roller with a cylindrical shape has a diameter of 3.5 m

    and length 1.2 m. It completes 18 revolutions each minute. Calculate the area it covers in 15 minutes.
    A 3,564 m² Correct Answer Incorrect Answer
    B 2,057.19 m² Correct Answer Incorrect Answer
    C 3,350.14 m² Correct Answer Incorrect Answer
    D 4,227 m² Correct Answer Incorrect Answer

    Solution

    ATQ,

    CSA = 2 × π × radius × height

    = 2 × (22/7) × (3.5/2) × 1.2

    = 2 × (22/7) × 1.75 × 1.2 = (92.4/7) m²

    Area in 1 minute = 18 × (92.4/7) = 1,663.2/7 m²

    Area in 15 minutes = 15 × (1,663.2/7) = 24,948/7 = 3,564 m²

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