Multiple Choice Questions on A man runs round a circular field of radius 50m at the speed of 12 km hr What is the time taken by t........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

A man runs round a circular field of radius 50m at the speed of 12 km hr What is the time taken by t...........

Quantitative Aptitude ( CCS) Mensuration 2D
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    A man runs round a circular field of radius 50m at the speed of 12 km/hr. What is the time taken by the man to take twenty rounds of the field?

    220/7 min

    Correct Answer

    110/7 min

    Incorrect Answer

    90/7 min

    Incorrect Answer

    230/7 min

    Incorrect Answer
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    Explanation:

    speed = 12 km/h = 12×5/18=10/3 m/s 
    distance covered = 20×2×22/7×50=44000/7 m
    time taken  = distance /speed =  44000/7×3/10sec
    =4400×3/7×1/60min
    =220/7min 

    By: MIRZA SADDAM HUSSAIN
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