Mathematics, 16.07.2021 17:20 starreee
.. A cistern has two pipes. The first and second pipes can fill the empty cistern in 12 hours and 18 hours respectively. If both pipes are opened together, how much time will the empty cistern need in order to be filled?
Answers: 3
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of the cistern every hour.
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of the cistern every hour.
of this cistern every hour.
for the two pipes to fill the entire cistern.
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