can you solve this question using chemical process

6.2 Heat Transfer in a Wooden Slab The heat flux through a slab made from wood 0.05m thick has been determined to be 40W/m2. The inner surface temperature of the wooden slab is 40C. The thermal conductivity of the wood is k=0.1W/(m.K). Develop an expression for the temperature distribution T(z) in the wooden slab. Determine the outer surface temperature of the wooden slab. Answer: 20C