OUTCOME TH$3$

I can analyze systems using the first law of thermodynamics

TH$3$: Heat transfers by conduction through an iron beam. If the hot end is at a temperature of $590$ K and the cool end is at $300$ K $,$ the cross$-$sectional area of the beam is $0\mathrm{.}25m^2,$ the length of the beam is $1\mathrm{.}5$ m $,$ and the thermal conductivity of iron is $72\frac{W}{m}K,$ what is the rate of heat transfer through the beam, in W$?$