A 900 L tank contains 450 L of water with a salt concentration of 14 g/L. Water with a salt concentration of 47 g/L flows into the tank at a rate of 82 L/min. The fluid mixes instantaneously, and is pumped out at a specified rate 44 L/min. Let y(t) denote the quantity of salt in the tank at time t. What is the salt concentration when the tank overflows?

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