$7-9.$ Determine the concentration of toluene over a diked area, where the diked area is $100f{t}^2,$ and the dike is in a process area $2500f{t}^2.$ The temperature is $65F.$

$7-10.$ Repeat Problem $7-9$ with a diked area of $2\mathrm{.}32m^3$ and a process area of $46\mathrm{.}5m^2.$ The temperature is $18C.$

Assume k $=0\mathrm{.}1$ and k$=0\mathrm{.}5$ to check good and poor mixing