Mathematics · Pipes and Cisterns
Pipes A and B can fill an empty cistern in 84 minutes and 36 minutes, respectively. Both Pipe A and Pipe B are opened together. After how much time should Pipe B be turned off so that the empty cistern is completely filled in a total of 42 minutes?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 124 minutes
- 218 minutes✓
- 312 minutes
- 415 minutes
Correct answer
18 minutes
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