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?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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