TS EAMCET 2015 Solved Paper

A copper rod of length 75 cm and an iron rod of length 125 cm are joining together end to end.Both are of circular cross section with diameter 2 cm. The free ends of the copper and iron are maintained at 100° C and 0° C respectively. The surfaces of the bars are insulated thermally the temperature of the copper -iron junction is
[Thermal conductivity of copper is 386.4W/m -K and that of iron is 48.46K]