<p>Two plates A and B have thermal conductivities&nbsp;<span class="equation">\(84 Wm^{-1}K^{-1}\)</span>&nbsp;and 126 <span class="equation">\(Wm^{-1}K^{-1}\)</span>respectively. They have same surface area and same thickness. They are placed in contact along their surfaces. If the temperatures of the outer surfaces of A and B are kept at&nbsp;<span class="equation">\(100^0C\)</span>&nbsp;and&nbsp;<span class="equation">\(0^0\)</span>C-*+- &nbsp;respectively, then the temperature of the surface of contact in steady state is _____________<span class="equation">\(^0C\)</span>​​​​​​​</p>