Mathematics · Time and Work
If two pipes A and B function simultaneously, an empty tank will be filled in 20 hours. If pipe A, working alone, fills this empty tank 9 hours faster than pipe B can fill it working alone, then how many hours does it take pipe B to fill this empty tank while working alone?
- 139 hours
- 236 hours
- 345 hours✓
- 442 hours
Correct answer
45 hours
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