1. A is four times efficient as B. B started the work and after 6 days, A joined him. If the whole work was completed in 12 days, in how many days A alone can finish the whole piece of work ?
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By: anil on 05 May 2019 01.21 am
Let work = 1 units Let time taken by A to complete the work = $$x$$ days => Time taken by B = $$4x$$ days Acc to ques, => $$frac{12}{4x} + frac{6}{x} = 1$$ => $$frac{6}{x} (frac{1}{2} + 1) = 1$$ => $$frac{3}{2} = frac{x}{6}$$ => $$x = frac{3}{2} imes 6$$ => $$x = 9$$ days
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