TS EAMCET Medical 2018 May 2 Shift 2 Paper

Two metal plates each of dimensions 20 cm x 50 cm and thickness 2 mm are soldered together as shown in the figure. Let the first plate Pi is at 100 °C and second plate P2 is at -10 °C. If the thermal conductivity of the two plates is KP1 = 44.6 W/mKand KP2 = 55.4 W/mK. then the heat flow through the plates at the soldered junction is