Solve the system of differential equation if two connected tanks as tank-1 contains 800 gal of water in which initially 15o lb of cement are dissolved and tank 2 contains 1200 gal of water in which initially 200 lb of cement are dissolved. Fresh water runs in the tank-1 at the rate of 80gal/min. The mixture is pumped from each tank to the other at the rates that is 130 gal/min from tank-1 to tank-2 and 50 gal/min from tank-2 to tank- 1. In addition, the mixture flows out from tank-2 at rate 80 gal/min.