Question Statement:
A High Temperature Short Time (HTST) pasteurizer processes milk at a flow rate of $3600\text{ L/h}$ ($0.001\text{ m}^3\text{/s}$). The holding tube has an internal diameter of $0.050\text{ m}$. To ensure the mandatory minimum holding time of $15.0\text{ seconds}$ for the fastest moving fluid particle (using laminar flow ratio $V_{avg} / V_{max} = 0.50$ or plug flow margin), for turbulent flow where $V_{max} \approx 1.20 V_{avg}$, if $t_{min} = \frac{L}{V_{max}} = 15.0\text{ s}$, with average velocity $V_{avg} = \frac{Q}{A} = \frac{0.001}{\frac{\pi}{4}(0.05)^2} = \frac{0.001}{0.0019635} = 0.5093\text{ m/s}$, taking $V_{max} = 1.20 \times 0.5093 = 0.611\text{ m/s}$, the minimum length of the holding tube $L$ in meters is ________ (round off to 2 decimal places).