Three material A B and C of equal thick-nes and of...

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Three material A, B and C of equal thick-nes and of thermal conductivity of 20, 40 & 60 kcal/hr. m. °C respectively are joined together. The temperature outside of A and C are 30°C and 100°C respectively. The interface between B and C will be at a temperature of __________ °C.

A. 40

B. 95

C. 70

D. 50

Answer: Option C

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