The velocity of upper layer of water in a river is $36 \mathrm{kmh}^{-1}$. Shearing stress between horizontal layers of water is $10^{-3} \mathrm{Nm}^{-2}$. Depth of the river is $\_\_\_\_$ m. (Co-efficiency of viscosity of water is $10^{-2} \mathrm{~Pa} . \mathrm{s}$ )
