Aptitude - Pipes and Cisterns - Discussion

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Q.

Three pipes A, B and C can fill a tank in 30 hours, 20 hours and 10 hours respectively. If all the pipes open together how much time is required to make the tank full?                         
A. 5 (5/11) Hrs B. 6 (5/11) Hrs
C. 7 (5/11) Hrs D. 8 (5/11) Hrs

Answer: Option A
Explaination:

 


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