A tank hold 300 gallons of brine solution. Brine is pumped into the tank at the rate of 3 gal/min and the well-stirred solution is pumped out at the rate of 2 gal/min. It stands to reason that since the brine solution is accumulating in the tank at the rate of 1 gal/min, any finite (capacity) tank must eventually overflow. Suppose that the tank has an open lid and has a total capacity of 400 gallons. a) When will the tank overflow? b) What will be the number of pounds of salt in the tank at the instant it overflows? c) Determine the number of pounds of salt in the tank ast → ∞.

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