Mathematics · Pipes and Cisterns
A pipe can fill a tank in 20 minutes. Another pipe can empty that tank in 30 minutes. If both pipes are opened alternately for one minute each (starting with the filling pipe), how long will it take to fill the tank?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1113 minutes
- 2125 minutes
- 3115 minutes✓
- 4112 minutes
Correct answer
115 minutes
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