Initially a tank holds 100 gal of a brine solution containing 4 lb of salt. At t = 0, brine containing 3 lbs of salt per gal is poured into the tank at the rate of 4 gal/min, while the wellstirred mixture leaves the tank at the rate of 4 gal/min. How long will it take for the tank to contain 10 lb of salt?
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