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A tank contains 1000 L of pure water. Brine that contains 0.05 kg of salt per...

A tank contains 1000 L of pure water. Brine that contains 0.05 kg of salt per liter of water enters the tank at a rate of 5 L/min. Brine that contains 0.04 kg of salt per liter of water enters the tank at a rate of 10 L/min. The solution is kept thoroughly mixed and drains from the tank at a rate of 15 L/min.

(a) How much salt is in the tank after t minutes?

(b) How much salt is in the tank after 10 minutes? (Round the answer to one decimal place.)

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