Aptitude - Pipes and Cisterns - Discussion

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Q.

Pipe A can fill the tank in 12 minutes and pipe B can empty it in 8 minutes. If 3/4th part of the tank is already full and both the pipes are open together. In much time both the pipes empty the tank?                         
A. 18 Min B. 19 Min
C. 20 Min D. 22 Min

Answer: Option A
Explaination:

 


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