Aptitude - Pipes and Cisterns - Discussion

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Q.

A cistern has two taps which fill it in 12 mm. and 15 mm. respectively. There is also a waste pipe in the cistern. When all the three are opened, the empty cistern is full in 20 minutes. How long will the waste pipe take to empty the full cistern ?                         
A. 8 mm B. 12 mm
C. 10 mm D. 16 mm

Answer: Option C
Explaination:

 


Discussion

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