Question $4$

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A $25$ cm thick brick wall of $4$ m by $3$ m and thermal conductivity $0\mathrm{.}5\frac{W}{m}.C$ has inner and outer surfaces at $30C$ and $25C,$ respectively. Furthermore, the outside air has a temperature of $0C$ and a convective heat transfer coefficient of $4\mathrm{.}5\frac{W}{m^{2.}}C.$ The rate of heat transfer between the wall and the air is:

a$.1578$ W

b$.1250$ W

c$.1350$ W

d$.1402$ W