Consider a very large vat that initially contains 10

Chapter , Problem 15

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Consider a very large vat that initially contains 10 gallons of clean water. Suppose water enters the vat from two pipes. From the first pipe, salt water containing 2 pounds of salt per gallon enters the vat at a rate of 1 gallon per minute. From the second pipe, salt water containing 0.2 pounds of salt per gallon enters the vat at a rate of 5 gallons per minute. Suppose the liquid is kept well mixed and salt water is removed from the vat at a rate of 3 gallons per minute. (a) Derive a differential equation for the total amount of salt S(t) in the vat at time t. (b) Convert this equation to a differential equation for the concentration C(t) of salt in the vat at time t. (c) What will the concentration of salt in the vat be after a very long time? (d) Find the concentration of salt in the vat at the time t = 5.

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