A) 5 days
B) 6 days
C) 10 days
D) \[10\frac{1}{2}\] days
Correct Answer: C
Solution :
(c): Work done by B + C in 3 days. \[=3\times \left( \frac{1}{9}+\frac{1}{12} \right)part=\frac{7}{12}part\] Part left\[=\frac{5}{12}\] \[A\to 1\text{ }work\Rightarrow 24\text{ }days\]. \[A\to \frac{5}{12}work\Rightarrow \frac{5}{24}\times 24=10days.\]
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