Project Theme $6$: Mixing container $2$

A mixing container has $560$ liters of saline solution that contains $7\mathrm{.}2$kg of dissolved salt. Clean water is pumped into the container at the rate of $5\mathrm{.}8$ liters per minute. Simultaneously the container discharges same volume of saline solution. How much salt does the container contain after a certain period? Formulate a differential equation modelling the quantity of salt in the container and solve it$.$ Draw a graph that shows the quantity of salt as a function of time $($kg$/$liter$).$