Aptitude - Pipes and Cisterns - Discussion

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Q.

Two pipes A and B can fill a tank in 25 minutes and 35 minutes respectively. But a third pipe C can empty it in 10 minutes. The first two pipes are kept open for 5 minutes in the beginning and then the third pipe is also opened. In what time is the cistern emptied?                         
A. 10(10/11) Hours B. 60 hrs
C. 70 hrs D. 20 hours

Answer: Option A
Explaination:

 


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