Mathematics · Time and Work
Pipe A can fill a tank in 30 minutes and Pipe B can fill it in 45 minutes. But a third Pipe C can empty the full tank in 15 minutes. Pipes A and B are kept open for 15 minutes in the beginning and then C is also opened. From that point on, what is the time required (in minutes) to empty the tank?
- 175✓
- 290
- 345
- 415
Correct answer
75
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