A tank initially contains 100 gal of brine whose salt concentration is 0.6 lb/gal. Brine whose salt concentration is 1 lb/gal flows into the tank at the rate of 2 gal/min. The mixture flows out at the rate of 3 gal/min. Find the salt content of the brine and its concentration at the end of 60 min. Hint. After 60 min, the tank contains 40 gal of brine.

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