Multiple Choice Questions on P is 20 more efficient than Q how much time will they working together take to complete a job which ........... for Bihar civil service (BPSC) Preparation

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Multiple Choice Questions

P is 20 more efficient than Q how much time will they working together take to complete a job which ...........

Quantitative Aptitude (CSC) Time and work
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    P is 20 % more efficient than Q, how much time will they working together take to complete a job which P alone could have done in 20 days ?

    9 days

    Incorrect Answer

    11 days

    Correct Answer

    17days

    Incorrect Answer

    22days

    Incorrect Answer
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    Explanation:

    Answer & Explanation
    Answer – B.11 days
    Explanation :
    P : Q = 100 : 120
    10/12 = 20/x
    12/10 = x/20
    X = 24
    Q = 1/24 or 20*120/100 = 24
    P+Q = 1/20 + 1/24
    = 24+20/480 = 44/480 = 10.91 = 11 days

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