Answer:
Heat flow through walls in 10 hours is

Step-by-step explanation:
Thermal conductivity of all the materials is as follows
1). Concrete = 0.8
2). Brick = 0.6
3). Fibreglass = 0.04
4). Corkboard = 0.04
Area of the wall is given as

now the thermal resistance due to each wall is given as




Now total thermal resistance of all walls



now rate of heat transfer per second is given as


