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## Homework Statement

A fire in a room rapidly raises the temperature of the surface of the wall to a steady value of 1000°C. on the other side of the wall is a large warehouse, whose ambient air temperature is 20°C. If the wall is solid brick, 200 mm thick, with thermal conductivity of 0.72 W/m°C, what is the steady state temperature of the surface of the wall ( on the warehouse side) in °C. You may assume the heat transfer coeffiecient of the air in the warehouse is 12W/m^2°C

## Homework Equations

d^2T/dx^2 =ρc dT/ kdt

## The Attempt at a Solution

this is a second order differential equation.

Please help me. thanks in advance!