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 100C and the inside heat transfer coefficient is 3k/l. If the wall temperature on the outside is held at 25C, what is the inside wall temperature in degree centigrade ?
A. 81.25
B. 35.5
C. 48.25
D. 43.75
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