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    Question

    P, Q and R take 18, 15 and 10 days respectively to

    complete a job. Compare their efficiencies as a ratio.
    A 5 : 6 : 9 Correct Answer Incorrect Answer
    B 5 : 5 : 6 Correct Answer Incorrect Answer
    C 5 : 6 : 4 Correct Answer Incorrect Answer
    D 5 : 6 : 10 Correct Answer Incorrect Answer

    Solution

    The time ratio taken by P, Q, and R is = 18:15:10 As we know, Efficiency is inversely proportional to time. Efficiency ratio of P, Q, and R = 1/18: 1/15: 1/10 = 90/18: 90/15: 90/10 = 5:6:9

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