Mathematics, 17.12.2019 20:31, small77

Pump a can fill a tank in 12 minutes, while pump b can fill the same tank in 24 minutes. both pumps are turned on together to fill the empty tank, but when tank became half full, pump b stops working and rest of the tank is filled by pump a only. how long it took to fill the tank?

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Pump a can fill a tank in 12 minutes, while pump b can fill the same tank in 24 minutes. both pumps...