A tank initially contains 20 L of water. A solution containing 1 g/L of chemical flows into the tank at a rate of 3 L/min, and the mixture flows out at a rate of 2 L/min. (i) Set up the above-mentioned initial-value problem mentioning each information mathematically, and hence solve it for the amount of chemical in the tank at time t. (ii) When does the concentration of chemical in the tank reach 0.5 g/L?

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