Question: Three materials A , B and C of equal thickness and of thermal conductivity of 2 0 , 4 0 & 6 0 kcal /

Three materials A, B and C of equal thickness and of thermal conductivity of 20,40 & 60 kcal/hr. m. C respectively are joined together. The temperature outside of A and C are 30C and 100C respectively. The interface between B and C will be at a temperature of _________ C.
40
95
70
50

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