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## Homework Statement

A tank containing 400 liters of water has 10 kg of salt solute (dissolved salt).

Some brine containing 0.03kg/L of salt is then introduced at a rate of 2 L/min.

The solution is constantly mixed and evacuated at a rate of 2L/min, such that the volume remains constant. If Q(t) is deﬁned as the quantity of salt (in kg) dissolved in the tank after time t (in minutes),

How do you find the differential equation?

## Homework Equations

dQ/dt = Rin-Rout

## The Attempt at a Solution

I have no idea how to find Rin or Rout, what do you need in their equations?