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

*/*_Three material A, B and C of equal thick-nes and of thermal conduc

1.	/_Three material A, B and C of equal thick-nes and of thermal conductivity of 20, 40 & 60 kcal/hr. m. ¬¨‚àûC respectively are joined together. The temperature outside of A and C are 30¬¨‚àûC and 100¬¨‚àûC respectively. The interface between B and C will be at a temperature of __________ ¬¨‚àûC.?
A.	40
B.	95
C.	70
D.	50
Answer» D. 50