A simple mixing process has primary characteristics. The 200 gal size in the initial steady state is shown in Figure P4.17. At = 0, the input amount changed from 5% salt solution to water. Exit flow rate is 0.5% after 30 minutes.

How much should the input amount be reduced in order to be below?

4.17. 1 . 200gal P4-17 4 . t=0 5% . 30 0.5%