Mathematics · Time and Work
Pipe A can fill a tank in 9 minutes, while pipe B can empty the completely filled tank in 18 minutes. To fill an empty tank, pipe A is opened initially and after 3 minutes, pipe B is also opened. In how much time (in minutes) will the remaining tank be filled completely?
- 131
- 28
- 34
- 412✓
Correct answer
12
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