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A tank contains 80 kg of salt and 1000 L of water. Pure water enters a...

A tank contains 80 kg of salt and 1000 L of water. Pure water enters a tank at the rate 6 L/min. The solution is mixed and drains from the tank at the rate 3 L/min. Find the amount of salt in the tank after 2 hours. What is the concentration of salt in the solution in the tank as time approaches infinity?

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