given the equation dt $=(($k$1*$Lo$)/($k$2-$k$1))*($e$^(-$k$1*$t$)-$e$^(-$k$2*$t$))+($Do$*$e$^(-$k$2*$t$)),$ answer the following prompt: $,$ if the DO

anywhere downstream of the discharge must be at least $6$ mg$/$L$,$ what is the maximum

value of L$0,($CBOD before discharge to the river$)?$ Also, the saturation DO is $10$ mg O$2/$L$.$