A) \[9\,\,{\scriptstyle{}^{1}/{}_{2}}\]days
B) \[8\,\,{\scriptstyle{}^{1}/{}_{2}}\] days
C) \[7\,\,{\scriptstyle{}^{1}/{}_{2}}\] days
D) \[11\,\,{\scriptstyle{}^{1}/{}_{2}}\] days
Correct Answer: C
Solution :
(c): A \[\to \] 1 day \[\Rightarrow \] 12 days A \[\to \]1 work \[\Rightarrow \frac{1}{12}\] work. B in 60% more efficient. \[\Rightarrow B\to 1\,day\Rightarrow \frac{1\times 1.6}{12}\]work. \[\Rightarrow \frac{4}{30}\]work. \[\therefore B\to \,work\Rightarrow \frac{30}{4}day=7\frac{1}{2}\]days.
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