Aptitude - Pipes and Cisterns - Discussion

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Q.

A cistern can be filled by pipe A and B in 25 hours and 30 hours respectively. There is also an outlet C which can empty it in 40 hours. If all the taps are open together. After 5 minutes pipe C must be turned off. In how much time the cistern is full?                         
A. 10(15/44) Hours B. 12(15/44) Hours
C. 20(15/44) Hours D. None of these

Answer: Option A
Explaination:

 


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