A cylindrical tank of $1.5 \mathrm{~m}$ diameter and $4 \mathrm{~m}$ height is filled with a liquid by a pipe of $2.5 \mathrm{~cm}$ internal diameter. The density and dynamic viscosity of the liquid are $1050 \mathrm{~kg} \mathrm{~m}^{-3}$ and $1.6 \times 10^{-3} \mathrm{~N} \mathrm{~s} \mathrm{~m}^{-2},$ respectively. If flow in the pipe is turbulent, the maximum time required to fill the tank is__________ hours.
A cylindrical tank of $1.5 \mathrm{~m}$ diameter and $4 \mathrm{~m}$ height is filled with a liquid by a pipe of $2.5 \mathrm{~cm}$ internal diameter. The density and dynamic viscosity of the liquid are $1050 \mathrm{~kg} \mathrm{~m}^{-3}$ and $1.6 \times 10^{-3} \mathrm{~N} \mathrm{~s} \mathrm{~m}^{-2},$ respectively. If flow in the pipe is turbulent, the maximum time required to fill the tank is__________ hours.