- A7 hours
- B12 hours
- C1 hour
- D1 5/7 hours
Step-by-Step Solution
Net per hour: 12 hours. 1 5/7 hours treats the drain as a second filler.
Answer: B) 12 hours
A pipe fills a tank in 3 hours; a drain empties it in 4 hours. Both are opened on an empty tank. How long to fill it?
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