Mathematics · Work and Time
Pipes A and B can fill an empty cistern in 20 min and 35 min, respectively. Both Pipe A and Pipe B are opened together. After how much time should Pipe A be turned off so that the empty cistern is completely filled in a total of 28 min?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 110 min
- 25 min
- 34 min✓
- 420 min
Correct answer
4 min
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