1. The problem statement, all variables and given/known data Consider a tank used in certain hydrodynamic experiments. After one experiment the tank contains 200 liters of a dye solution with a concentration of 1 g/liter. To prepare for the next experiment, the tank is to be rinsed with fresh water flowing in at a rate of 2 liters/min, the well-stirred solution flowing out at the same rate. Find the time that will elapse before the concentration of dye in the tank reaches 1% of its original value. 2. Relevant equations [tex]\frac{dQ}{dt}[/tex]=rate in - rate out 3. The attempt at a solution Why the heck do they cancel units incorrectly?
Then all the terms in your equation should have units of grams of dye per minute. I think the Q/100 l/min should be g/min. Probably a typo.