Learning Target 4: I can check if a given function is the solution to a differential equation. I can translate a written statementinto a differential equation. I can solve separable differential equations.A tank contains 300 litres of water and 100 litres of pollutants. Fresh water is pumped into the tank at the rate of2litres per minute, and the well-stirred mixture leaves at the same rate. How long does it take for the concentrationof pollutants in the tank to decrease to110of its original value?Note: Acceptable work must include a clear definition of the variables you are using, including units.