Mathematics · Pipes and Cisterns
An inlet pipe fills up a cistern in 2 hours, while an outlet pipe empties it in 4 hours. The empty cistern was being filled up with both pipes open for 1 hour, after which the outlet pipe was closed. How long will it take in total to fill up the cistern?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 11 hour 30 minutes
- 23 hours
- 32 hours 30 minutes✓
- 42 hours 15 minutes
Correct answer
2 hours 30 minutes
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