Heat lost through a window

The glass of a window has area $1.5{\mathrm{m}}^2$, thickness $4.0\mathrm{mm}$ and thermal conductivity $k=0.80W/(\mathrm{m}\cdot \mathrm{K})$. Its two faces are at temperatures that differ by $2.0\mathrm{K}$. Compute the power lost by conduction.