- A6 minutes
- B9 minutes
- C18 minutes
- D12 minutes
Step-by-Step Solution
In 18 minutes A alone adds tanks, so B must remove minutes.
Answer: D) 12 minutes
Pipe A fills a tank in 12 minutes; pipe B empties it in 24 minutes. Both are opened on an empty tank. After how many minutes should B be closed so that the tank is full in exactly 18 minutes?
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