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    Question

    The time taken by ‘X’, ‘Y’ and ‘Z’ to complete

    a task is ‘6n’ days, ‘9n’ days and ‘12n’ days, respectively. What is the ratio of their efficiencies?
    A 5:4:7 Correct Answer Incorrect Answer
    B 6:4:3 Correct Answer Incorrect Answer
    C 2:8:9 Correct Answer Incorrect Answer
    D 1:5:7 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Since, efficiency is inversely proportional to time taken

    So, ratio of efficiency = (1/6n) : (1/9n) : (1/12n) = 6 : 4 : 3

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