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Question

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

Options:

A . 40

B . 95

C . 70

D . 50

Answer: Option C

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