Bunce’s farm has a 10 L water tank fed by a stream running fromBoggis’ Chicken Ranch. Water from the stream flows into and out ofBunce’s tank at a rate of 10 L/minute which keeps it well-mixed.One day Bunce finds out that Boggis has been dumping chicken manureinto the river which adds Salmonella to the stream at an unknownconcentration of a mcfu/L (Note: mcfu is a unit of measurement forbacteria standing for “millions of colony forming units”). At thetime of his discovery, Bunce measures the concentration ofSalmonella in his tank to be 1 mcfu/L and one minute later measuresit again to be 2 mcfu/L. Use these measurements to determine theconcentration of Salmonella in the river and the limitingconcentration of resulting Salmonella in Bunce’s tank.
