Aptitude - Pipes and Cisterns - Discussion

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Q.

P, Q and R are three pipes connected to a tank. P and Q together fill the tank in 4 hours. R and Q together fill the tank in 6 hours. P and R together fill the tank in 5 hours. In how much time will P, Q and R fill the tank together?                         
A. 3(9/37) Hours B. 2(9/37) Hours
C. 4(9/37) Hours D. None

Answer: Option A
Explaination:

 


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