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    Question

    If A, B and C can do a work in 6 days, 9 days and 11

    days, respectively, then, working together, how many days will they take to do the work?
    A 1(52/73) Correct Answer Incorrect Answer
    B 4(52/73) Correct Answer Incorrect Answer
    C 2(52/73) Correct Answer Incorrect Answer
    D 3(52/73) Correct Answer Incorrect Answer

    Solution

    ATQ,

    A's work rate: A completes the work in 6 days, so A does 1/6 of the work in 1 day. B's work rate: B completes the work in 9 days, so B does 1/9 of the work in 1 day. C's work rate: C completes the work in 11 days, so C does 11/11 of the work in 1 day. Combined work rate: Together, they complete: Find the combined rate : Time to complete the work : To complete 1 full work, the time taken is:  = or 2(52/73) days

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