Aptitude - Pipes and Cisterns - Discussion

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Q.

Two pipes A and B can fill a tank in 12 minutes and 16 minutes respectively. If both the pipes open together after how much time should be B closed so, that the tank is full in 9 minutes?                         
A. 5 Hours B. 4 Hours
C. 6Hours D. 8 Hours

Answer: Option B
Explaination:

 


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