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    Question

     P can do a work in 20 days, Q in 30 days. They work

    together, but P leaves 5 days before completion. Find total time.
    A 15 Correct Answer Incorrect Answer
    B 18 Correct Answer Incorrect Answer
    C 12 Correct Answer Incorrect Answer
    D 10 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, Let total time be T. (T-5)/20 + T/30 = 1 3(T-5) + 2T = 60 5T = 75 -> T = 15

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