A tank initially holds 10 gal of fresh water. at t=0, a brine solution containing 1/2 lb of salt per gallon is poured into the tank at a rate of 2 gal/min, while the well-stirred mixture leaves the tank at the same rate. Find the concentration of salt in the tank at t= 15 mins. Select the correct response: 0.32 0.43 0.48

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