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    Question

    X can finish a task in 20 days, while Y can do it in 25

    days. If Z needs 1.2 times the time taken by X and Y together, find the number of days Z will take to complete the same task.
    A 17.33 days Correct Answer Incorrect Answer
    B 27.27 days Correct Answer Incorrect Answer
    C 20.20 days Correct Answer Incorrect Answer
    D 13.33 days Correct Answer Incorrect Answer

    Solution

    ATQ,

    Time taken by X and Y together to complete the work = (20 × 25)/ (20 + 25) = 11.11 days

    Time taken by Z alone to complete the work = 1.2 × 11.11 = 13.33 days

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