Subject

    Quantitative Aptitude

    Topic

    Areas & Volumes

    The wheel of a motorcycle 70cm in diameter makes 40 revolutions in every 10sec.What is the speed of motorcycle n km/hr?

    ক)
    13.68kmph
    খ)
    31.68kmph
    গ)
    41.68kmph
    ঘ)
    45.68kmph

    Explanation

    In this type of question, we will first calculate the distance covered in given time. Distance covered will be : Number of revolutions x Circumference So we will be having distance and time, from which we can calculate the speed. Radius of wheel = 70 / 2 = 35 cm Distance covered in 40 revolutions will be 40∗circumferene=40∗2πr=40∗2∗227∗35=8800cm40\ast circumferene=40\ast2\mathrm{πr}=40\ast2\ast\frac{22}7\ast35=8800\mathrm{cm} = 88 m Distance covered in 1 sec  = 8810=8.8m/s=8.8∗185km/hr=31.68km/hr\frac{88}{10}=8.8m/s=8.8\ast\frac{18}5km/hr=31.68km/hr

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