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    Question

    Anu is four times as good as Binni at doing a work.

    Together they finish the same work in 12 hours. In how many hours will Anu alone finish the work?
    A 18 Correct Answer Incorrect Answer
    B 21 Correct Answer Incorrect Answer
    C 20 Correct Answer Incorrect Answer
    D 15 Correct Answer Incorrect Answer

    Solution

    ATQ, Let the efficiency of Binni be x So, the efficiency of Anu = 4x Effective efficiency of the them = x + 4x = 5x Total work = 12 × 5x ⇒ 60x units Now, Time taken by Anu to complete the work alone = 60x/4x ⇒ 15 hours

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