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Three rods of lengths 20cm each and area...

Three rods of lengths 20cm each and area of cross-section `1cm^(2)` are joined to form a triangle ABC. The conductivities of the rods are `K_(AB)=50J//m-s-^(0)C,K_(BC)=200J//m-s-""^(0)C` and `K_(AC)=400J//m-s-""^(0)C`. The junctions A, B and C are maintained at `40^(@)C,80^(@)C` and `80oC` respectively. The rate of heat flowing through the rod AB is __________ W

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