Problem $5$

Suppose there is a river that has a flow rate of $3\mathrm{.}00\frac{m^3}{s}$ with negligible concentration of sodium chloride and a stream discharges into this river at a flow rate of $0\mathrm{.}05\frac{m^3}{s}.$ The concentration of sodium chloride of the out flow after mixing is to be $1\mathrm{.}0m\frac{g}{L}.$

What should be the inflow concentration of sodium chloride in the stream to maintain a steady state condition? Consider a completely mixed system.

Calculate the mass rate $(k\frac{g}{d})$ of the sodium chloride in the stream?