Mathematics · Pipes and Cisterns
Pipe A can fill an empty cistern in 18 hours, while Pipe B can drain a full cistern in 30 hours. When the cistern is empty, Pipe A is turned on for an hour and then turned off. Next, Pipe B is allowed to drain water from the cistern for an hour and then turned off. The pipes are alternately left open for an hour each time until the cistern is full. How much total time does it take for the cistern to be completely filled?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 186 hours 48 minutes✓
- 290 hours
- 386 hours 40 minutes
- 445 hours
Correct answer
86 hours 48 minutes
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