Consider a blending process with $w_1=1400k\frac{g}{m}in,w_2=600k\frac{g}{m}in,x_1=0\mathrm{.}2,$ and $x_2=0\mathrm{.}9$ in a stirred tank with constant $V=5m^3.$ The liquid density is constant at $1000k\frac{g}{m^3}.$ At time $t=0,x_1$ is suddenly changed from $0\mathrm{.}2$ to $0\mathrm{.}5.$ Estimate the exit stream concentration at $t=$ time constant and at very long time.