A) 20 days
B) \[22\frac{1}{2}\] days
C) 25 days
D) 30 days
Correct Answer: B
Solution :
(b): A can do work in x days. B can do work in 3x days. \[\therefore 3x-x=60\] \[x=30.\] Together time \[=\frac{1}{\frac{1}{x}+\frac{1}{3x}}=\frac{3x}{4}\] \[=\frac{3\times 30}{4}=\frac{90}{4}=22\frac{1}{2}\] days.You need to login to perform this action.
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