Aptitude - Pipes and Cisterns - Discussion

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Q.

One tap can fill a cistern in 2 hours and another tap can empty the cistern in 3 hours. How long will they take to fill the cistern if both the taps are opened ? (Railways 1989)                         
A. 5 hrs B. 7 hrs
C. 6 hrs D. 8 hrs

Answer: Option C
Explaination:

 


Discussion

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