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    Question

    Working alone, A can do a job in 15 days and B can do

    the same job in 18 days. In how many days will the job be completed if both work together?
    A 10/3 days Correct Answer Incorrect Answer
    B 36/5 days Correct Answer Incorrect Answer
    C 5/36 days Correct Answer Incorrect Answer
    D 90/11 days Correct Answer Incorrect Answer

    Solution

    A                     B 15                     18                  90 (total work)    6                      5          Efficiency Take total time =90/6+5 = 90/11

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