# 2. A tank contains 100 gallons of pure water. Beginning at t O, a salt water solution containing 0.2 pounds

###### Question:

2. A tank contains 100 gallons of pure water. Beginning at t O, a salt water solution containing 0.2 pounds of salt per gallon is pumped into the tank at a rate of 3 gallons per minute. At the same time, a drain is opened at the bottom of the tank which allows the mixture to leave the tank at a rate 3 gallons per minute. Assume the solution is kept perfectly mixed. (a) What will be concentration of salt (in pounds per gallon) after 15 minutes? (b) Discuss the salt concentration level over time.

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