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    Question

    P and Q can do a piece of work in 20 days and P alone

    can do it in 30 days. In how many days can B do it alone.
    A 60 days Correct Answer Incorrect Answer
    B 20 days Correct Answer Incorrect Answer
    C 10 days Correct Answer Incorrect Answer
    D 35 days Correct Answer Incorrect Answer

    Solution

    ATQ, (Efficiency = work/Time) The efficiency of P and Q in 1 day is = 1/20 The efficiency of P in 1 day = 1/30 Therefore the efficiency of Q in 1 day is = (1/20) – (1/30) = (1/60) Therefore Q will take 60 days to complete.

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