tank contains 40 gallons pure water brine 3 pounds salt gallon flows

A tank contains 40 gallons of pure water. Brine with 3 pounds of salt per gallon flows in at the rate of 2 gallons per minute. The thoroughly stirred mixture then flows out at the rate of 3 gallons per minute.

a) Find the amount of salt in the tank at any time t

b) When is the amount of salt in the tank the greatest and what is this maximum amount?

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