A power tiller with diesel engine produces $12 \mathrm{~kW}$ of brake power with a brake thermal efficiency of $30 \%$. If the air-fuel ratio in the combustion process is 14: 1 and heating value of the fuel is $45 \mathrm{MJ} \mathrm{kg}^{-1}$, air consumption rate of the engine will be_________ $\mathrm{kg} \mathrm{h}^{-1}$
A power tiller with diesel engine produces $12 \mathrm{~kW}$ of brake power with a brake thermal efficiency of $30 \%$. If the air-fuel ratio in the combustion process is 14: 1 and heating value of the fuel is $45 \mathrm{MJ} \mathrm{kg}^{-1}$, air consumption rate of the engine will be_________ $\mathrm{kg} \mathrm{h}^{-1}$