Q$10.$ Estimate D$0$ after mixing

The town of State College discharges $17,360\frac{m^3}{d}$ of treated wastewater into the Bald Eagle Creek. The treated wastewater has a $BO{D}_5$ of $12m\frac{g}{L}$ and a $k$ of $0\mathrm{.}12d^{-1}$ at $20C.$ Bald Eagle Creek has a flow rate of $0\mathrm{.}43\frac{m^3}{s}$ and an ultimate BOD of $5\mathrm{.}0m\frac{g}{L}.$ The $DO$ of the river is $6\mathrm{.}5m\frac{g}{L}$ and the $D0$ of the wastewater is $1\mathrm{.}0m\frac{g}{L}.$ The stream temperature is $10C$ and the wastewater temperature is $10C.$ Compute the $DO$ and initial ultimate BOD after mixing.

If the stream temp is $10C$ and the wastewater temp is $20C??$