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The wall of a pipe of radius $1\:m$  is at a uniform temperature of  $200\:^{\circ}C$, and is covered by insulation of thickness $0.1\:m$. The ambient air outside the insulated pipe is at $20\:^{\circ}C$ and has heat transfer coefficient of $10\:W\:m^{-2}\:K^{-1}$. The thermal conductivity of the insulation material is $0.05\:W\:m^{-1}\:K^{-1}$. If the heat transfer occurs at steady state, the temperature (in $^{\circ}C$) of the outer surface of insulation is ____________________ (rounded off to second decimal place).
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