Aptitude - Pipes and Cisterns - Discussion

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Q.

A pipe A can fill the tank in 10 hrs, B can fill it in 20 hrs and C can empty in 40 hrs. All are opened at the same time. After how many hours shall the pipe B be closed such that the tank can be filled in 10 hrs?                         
A. 5 hrs B. 6 hrs
C. 7 hrs D. 8 hrs

Answer: Option A
Explaination:

 


Discussion

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