Mathematics · Time and Work
A cistern has two inlet pipes, A and B, which can fill it in 12 hours and 18 hours, respectively. There is also a drain pipe, C, that can empty the full cistern in 36 hours. If all three pipes are opened together, then how long will it take to fill the cistern?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 16 hours
- 210 hours
- 39 hours✓
- 412 hours
Correct answer
9 hours
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