Aptitude - Pipes and Cisterns - Discussion

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Q.

Two pipes A and B can fill a tank in 10 hours and 12 hours respectively. B is open for 2 hours in the beginning, and then B is closed. In how much time A fill the remaining tank?                         
A. 2(1/3) Hours B. 4(1/3) Hours
C. 6(1/3) Hours D. 8(1/3) Hours

Answer: Option D
Explaination:

 


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