Determine the inside plate temperature, Physics

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A carbon steel plate (thermal conductivity = 45 W/m^oC) (600 x 900 x 25) mm² is maintained at 310^oC. Air at 15^oC bellows over the hot plate.
If convection heat transfer co-efficient is 22 W/m^oC and 250 W is lost from the plate surface by radiation, Determine the inside plate temperature.

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