A 8 0 0 0 8 0 0 0 g mass of Mercury was dumped into the ocean 1 0 0 1 0 0 m

A $8000$g mass of Mercury was dumped into the ocean $100$ m off$-$shore of Miami Beach. The water in this region mixes in the x$,$ y$,$ and z direction at a turbulent diffusivity of D$=3\mathrm{.}0$ m$\mathrm{Unknown\; node\; type:\; sup}/$s$.$ Assume mean water velocity $=0$ m$/$s$,$ and solve for mixing in $3-$dimensions. 

 

A$)$ What is the maximum concentration of mercury $50$m off the coast $50$ min after the release?

 

 B$)$ How long do you have to wait until the concentration everywhere is less than $4\mathrm{.}0$g$/$m$\mathrm{Unknown\; node\; type:\; sup}?$