Walls of a Cubical Oven Are of Thickness L, and They

Multiple Choice

Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer coefficient is „3k/l'. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade?

A) 35.5
B) 43.75
C) 81.25
D) 48.25