A Heat Conducting Rod,1

Multiple Choice

A heat conducting rod,1.60 m long and wrapped in insulation,is made of an aluminum section that is 0.90 m long and a copper section that is
Long.Both sections have a cross-sectional area of
The aluminum end and the copper end are maintained at temperatures of
And
Respectively.The thermal conductivities of aluminum and copper are 205 W/m ∙ K (aluminum) and 385 W/m ∙ K (copper) .At what rate is heat conducted in the rod under steady state conditions?

A) 9.0 W
B) 7.9 W
C) 10 W
D) 11 W
E) 12 W