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Solve with a complete and organized solutions

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Solve with a complete and organized solutions. Express the final answer in three decimal places. Enclose all the final answer.

A 2m diameter disk made of brick fire 30cm thick is in contact with a 3m x 2m insulating brick wall that is 3cm thick. Determine the temperature between the surfaces of wood and insulating wall. The temperature on the free sides of the wood and insulating brick is 60 degrees Celsius and 50 degrees Celsius respectively. The thermal conductivity of the wood is 0.47 W/m-K and 0.15 W/m-K for the insulating brick wall. How long would it to generate a power of 20 Watts?