A tank contains 60 kg of salt and 1000 L of water. A solution of concentration .03 kg of salt per liter enters a tank at a rate of 9 L/min. The solution is mixed and drains the tank at the same rate. -- What is the concentration of the solution initially in kg/L? What is the amount of salt after 4.5 hours in kg? What is the concentration of salt as time approaches infinity in kg/L?

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