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    Question

    Three workers A, B and C, can complete a task in 15, 18

    and 28 days, respectively. If they all work together, how long will it take to complete the task (rounded off to two decimal places)?
    A 6.59 days Correct Answer Incorrect Answer
    B 6.03 days Correct Answer Incorrect Answer
    C 6.33 days Correct Answer Incorrect Answer
    D 6.86 days Correct Answer Incorrect Answer

    Solution

    Work done by A in 1 day = 1/15 Work done by B in 1 day = 1/18 Work done by C in 1 day = 1/28 Total work done in 1 day = 1/15 + 1/18 + 1/28 = 199/1260 Time taken to complete the work = 1260/199 = 6.33 days

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