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    Subject

    Quantitative Aptitude

    Topic

    Areas & Volumes

    A wheel makes 1000 revolutions in covering a distance of 88 km. Find the radius of the wheel.

    ক)
    14
    খ)
    11
    গ)
    9
    ঘ)
    20

    Explanation

    Distance covered in one revolution 88×10001000\frac{88\times1000}{1000} = 88m. 2πR2=88    ⇒2×227×R=88    ⇒R=88×7442\mathrm{πR}^2=88\;\;\Rightarrow2\times\frac{22}7\times\mathrm R=88\;\;\Rightarrow\mathrm R=88\times\frac7{44}

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