$2\mathrm{.}6-6.$ Overall Mass Balance for Uusteady$-$sitate Process. A sturage vesse$$ is welt stime$$ and contains $500kg$ of total solucioce wited $d$ concentation of $5\mathrm{.}0\%$ salt. A constant flow rate of $900k\frac{g}{h}$ of salt solution coutainug $16\mathrm{.}57\%$ saht is suddenky tutroduced into the tank and a constant withdrawai rate of $000kg\text{'}$h is also started. These two flows remain constant thereafter. Decive an equation relating tae outhet withdrawal concentration as a function of titue. Also, calculate the concentration after $2\mathrm{.}0h.$