Mathematics · Work and Time
Two pipes can fill a cistern, individually, in 70 min and 30 min, respectively. There is a pipe located at the bottom of the cistern to empty it. If all three pipes are opened simultaneously, then the empty cistern gets filled in 28 min. How long will the pipe at the bottom take to empty the completely filled cistern if no other pipe is open?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 167 min
- 281 min
- 384 min✓
- 480 min
Correct answer
84 min
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