Question

    ‘P’ and ‘Q’ can complete a certain job together in

    20 days. If ‘P’ can do the job alone in 50 days, in how many days can ‘Q’ do it working alone?
    A 150/19 days Correct Answer Incorrect Answer
    B 126/11 days Correct Answer Incorrect Answer
    C 100/3 days Correct Answer Incorrect Answer
    D 120/5 days Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let total work = 100 units. {LCM (20 and 50)}

    Combined efficiency = 100 ÷ 20 = 5 units/day

    Efficiency of 'P' = 100 ÷ 50 = 2 units/day

    Efficiency of 'Q' = 5 - 2 = 3 units/day

    Time taken by 'Q' alone = 100 ÷ 3 = (100/3) days

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