Mathematics · Pipes and Cisterns
One pipe can fill a tank in 20 minutes while another pipe can empty it in 60 minutes. If both pipes are operated together, how long will it take to fill the tank completely?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 130 minutes✓
- 210 minutes
- 340 minutes
- 420 minutes
Correct answer
30 minutes
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