A pipe with outer diameter of $0.02\text{ m}$, carries hot water. The temperature at the outer surface of the pipe is $70\ ^\circ\text{C}$. This pipe is covered with two concentric layers of insulation, each having a thickness of $0.01\text{ m}$. The first layer (adjacent to the pipe) is made up of felt material (thermal conductivity $k_f = 0.12\text{ W m}^{-1}\ ^\circ\text{C}^{-1}$), and the next layer is made up of asbestos (thermal conductivity $k_{as} = 0.15\text{ W m}^{-1}\ ^\circ\text{C}^{-1}$). The insulated pipe is exposed to ambient air at $20\ ^\circ\text{C}$. The convection heat transfer coefficient at the outer insulation layer is $3\text{ W m}^{-2}\ ^\circ\text{C}^{-1}$. At steady state, neglecting heat transfer due to radiation, the heat loss per unit length at the outer insulation layer (in $\text{W m}^{-1}$) is _____ (rounded off to two decimal places).