Question: A cylindrical copper rod ( kCu = 4 0 0 W / m K ) and an iron rod ( kFe = 8 0 0

A cylindrical copper rod (kCu=400 W/mK) and an iron rod (kFe=800 W/mk) with exactly the same dimensions are welded together end to end. The outside end of the copper rod is held at 115C, and the outside end of the iron rod is held at 5C.
What is the temperature at the midpoint where the rods are joined together?
Tmid=

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