A rod C D of thermal resistance 10 . 0 KW - 1 is joined at the middle of an identical rod A B as shown in…

A rod $CD$ of thermal resistance $10.0{\mathrm{KW}}^{-1}$ is joined at the middle of an identical rod $AB$ as shown in figure. The ends $A, B$ and $D$ are maintained at $200°\mathrm{C},100°\mathrm{C}$ and $125°\mathrm{C}$ respectively. The heat current in $CD$ is $P \mathrm{W}$. The value of $P$ is