Mathematics · Pipes and Cisterns
Two pipes can fill a cistern, individually, in 60 min and 20 min, respectively. There is a pipe located at the bottom of the cistern to empty it. If all the three pipes are opened simultaneously, then the empty cistern gets filled in 30 min. How long will the pipe at the bottom of the tank take to empty the completely filled cistern if no other pipe is open?
- 160 min
- 278 min
- 365 min
- 430 min✓
Correct answer
30 min
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