Mathematics · Pipes and Cisterns
Two inlet pipes can separately fill a cistern completely in 8 hours and 10 hours, respectively. They are operated together for 2 hours, after which the second pipe is closed, and an outlet pipe which can drain out water from the full cistern in 20 hours is opened. How much total time will it take to fill the cistern completely from the instant the outlet pipe is opened?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 18 hours 40 minutes
- 27 hours 20 minutes✓
- 38 hours
- 47 hours
Correct answer
7 hours 20 minutes
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