Mathematics, 20.02.2020 17:16 roblesjairus
A pipe can fill a cistern in 30 minutes and a waste-pipe can empty it in 1 hour. If both pipes are opened at once when the cistern is empty, how long will it take to fill the cistern?
plz plz solve it..I am confused
Answers: 3
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A pipe can fill a cistern in 30 minutes and a waste-pipe can empty it in 1 hour. If both pipes are o...
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