Solve this problem using English units; do not convertthis problem to SI$.$ The inner and outer surfacestemperatures of a $1-$D slab of material, with a thicknessof $4\mathrm{.}2$ inches, are $180\mathrm{.}0\backslash$deg F and $63\mathrm{.}0\backslash$deg F respectively.Determine the heat flux through the material in units ofBTU$/($hr$-$ft$2)$ if the material is:a$)$ Stainless steel, k $=8\mathrm{.}95$ BTU$/($hr$-$ft$-\backslash$deg F$)$b$)$ Aluminum, k $=131$ BTU$/($hr$-$ft$-\backslash$deg F$)$c$)$ Soil, k $=\mathrm{.}30$ BTU$/($hr$-$ft$-\backslash$deg F$)$