The wall of a cold storage is made up of four layers; concrete, brick, cardboard and paint with respective thickness of 5,60,8 and $1 \mathrm{~mm}$, and their corresponding thermal conductivities are 0.8,0.7,0.04 and $0.15 \mathrm{~W} \mathrm{~m}^{-1} \mathrm{~K}^{-1}$. The overall resistance of the wall to conduction heat transfer in $\mathrm{m}^{2} \mathrm{~K} \mathrm{~W}^{-1}$ is________________

The wall of a cold storage is made up of four layers; concrete, brick, cardboard and paint with respective thickness of 5,60,8 and $1 \mathrm{~mm}$, and their corresponding thermal conductivities are 0.8,0.7,0.04 and $0.15 \mathrm{~W} \mathrm{~m}^{-1} \mathrm{~K}^{-1}$. The overall resistance of the wall to conduction heat transfer in $\mathrm{m}^{2} \mathrm{~K} \mathrm{~W}^{-1}$ is________________

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