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A liquid containing 3 g/L of titanium is added to a 72 L tank at the...

A liquid containing 3 g/L of titanium is added to a 72 L tank at the increasing rate of 4t L/min. (Note: t is time in minutes). The liquid is well-mixed, and 4t L/min is removed from the tank, keeping the volume of liquid in the tank at 72 L. If the tank is initially full, and contains no titanium, how many minutes later does the tank contain 54 g of titanium?

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