Mathematics · Time and Work
A cistern has two inlet pipes, A and B, which can fill it in 10 hours and 20 hours, respectively. There is also a drain pipe C that can empty the full cistern in 40 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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- 18 hours✓
- 27 hours
- 36 hours
- 49 hours
Correct answer
8 hours
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