A) 10 days
B) 9 days
C) 12 days
D) 15 days
Correct Answer: B
Solution :
Work done by (A + B) in 5 days \[=5\left( \frac{1}{12}+\frac{1}{20} \right)=5\left( \frac{5+3}{60} \right)=\frac{40}{60}=\frac{2}{3}\] Remaining work \[=1-\frac{2}{3}=\frac{1}{3}\] Time taken by C in doing \[\frac{1}{3}\] work = 3 days \[\therefore \] Required time \[=3\times 3=9\] daysYou need to login to perform this action.
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