A storm sewer is carrying snow melt containing $1\mathrm{.}200$ g$/$L of pesticide

into a small stream. The stream has an occurring pesticide

concentration of $20$ mg$/$L$.$ If the storm sewer flow rate is $2,000$ L$/$min

and the stream flow rate is $2\mathrm{.}0$ metre cube per second, what is the concentration of

pesticide in the stream after the discharge point? Assume that the

sewer flow and the stream flow are completely mixed, that the pesticide

is a conservative substance $($it does not react$),$ and that the system

is at a steady state.