A microbe that follows Monod growth kinetics on a limiting substrate (maximum specific growth rate of $0.5 \mathrm{~h}^{-1}$ and Monod constant of $0.1 ~\mathrm{mg} \mathrm{L}^{-1}$ ) is cultivated in a continuous reactor for microbial growth (chemostat) with sterile feed. Given that the chemostat volume is $5 \text{ L}$ and inlet concentration of limiting substrate is $10 \mathrm{~g} \mathrm{~L}^{-1}$, the minimum inlet feed flow rate for chemostat washout is $\_\_\_\_$ $\mathrm{L} \mathrm{h}^{-1}$. (rounded off to one decimal place)
