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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 ?1). 102). 93). 84). 12 |
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Answer» Solution Let work = 1 units Let time taken by A to complete the work = $x$ days => Time taken by B = $4x$ days Acc to QUES, => $\frac{12}{4x} + \frac{6}{x} = 1$ => $\frac{6}{x} (\frac{1}{2} + 1) = 1$ => $\frac{3}{2} = \frac{x}{6}$ => $x = \frac{3}{2} \times 6$ => $x = 9$ days |
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