a large plane wall is composed of $20$ cm layer of refractory brick $($k$=1\mathrm{.}3$ W$/$mK$)$ and a $5$cm layer of insulating material with thermal conductivity varying as k$=0\mathrm{.}035+0\mathrm{.}0017$ T$.$ If the outer surface of brick and insulating material are at $1094$C and $38$C$.$ Determine the temperature at the interface and also the heat loss from the material.