Mathematics
Mathematics, 23.08.2019 18:00, brownsade1648

Atank can be filled in 60 minutes and drained in 90 minutes. how long would it take to fill the tank if the drain were accidentally left open while the tank was being filled?

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Atank can be filled in 60 minutes and drained in 90 minutes. how long would it take to fill the tank...

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