A) 7
B) \[7\frac{1}{2}\]
C) 8
D) \[8\frac{1}{4}\]
Correct Answer: D
Solution :
Part of the tank filled in 3 minutes by pipes P and Q \[=3\left( \frac{1}{12}+\frac{1}{15} \right)=3\left( \frac{5+4}{60} \right)=\frac{3\times 9}{60}=\frac{9}{20}\] Remaining part \[=1-\frac{9}{20}=\frac{11}{20}\] \[\therefore \] Time taken by \[Q=\frac{11}{20}\times 15=\frac{33}{4}\]\[=8\frac{1}{4}\] minutesYou need to login to perform this action.
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