Mathematics · Time and Work
Two pipes A and B can fill a cistern in 15 hours and 20 hours respectively. An emptying tap can empty the full cistern in 10 hours. All three taps were opened together for 4 hours, after which it was realized that the emptying tap had been left open, and it was then closed. How many more hours would it take for the cistern to be completely filled?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 110 hours
- 28 hours✓
- 36 hours
- 44 hours
Correct answer
8 hours
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