A) 10 hours
B) 12 hours
C) 16 hours
D) 18 hours
E) None of these
Correct Answer: B
Solution :
Explanation Option (b) is correct. Work done by A in 1 hour \[=\frac{1}{4}\] Work done by B and C in 1 hour \[=\frac{1}{3}\] Work done by A and C in 1 hour \[=\frac{1}{2}\] Work done by A, B and C in hour \[=\left( \frac{1}{4} \right)+\left( \frac{1}{3} \right)=\frac{7}{12}\] Work done by B in 1 hour \[=\left( \frac{7}{12} \right)-\left( \frac{1}{2} \right)=\frac{1}{12}\] \[\Rightarrow \]B alone can complete the work in 12 hour
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