Mathematics · Pipes and Cisterns
A cistern has two inlet pipes, A and B, which can fill it in 15 hours and 12 hours, respectively. There is also a drain pipe C, which can empty the full cistern in 60 hours. If all three pipes are opened together, how long will it take to fill the cistern?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 17 hours and 30 minutes✓
- 27 hours and 45 minutes
- 36 hours and 30 minutes
- 46 hours and 45 minutes
Correct answer
7 hours and 30 minutes
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