- A12 h
- B15 h
- C20 h
- D10 h
Step-by-Step Solution
fill per hour; in 4 h . The last took 6 h → net . C → 12 h.
Answer: A) 12 h
A tank has pipes A and B that fill it in 12 and 15 hours and a drain C. A and B are opened together; after 4 hours C is also opened, and the tank fills 6 hours after that. How long would C alone take to empty the full tank?
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