In a feed milling plant, it has been observed that $80 \%$ of the feed passes through IS sieve 340 ( $3.25 \mathrm{~mm}$ opening) and $80 \%$ of the ground feed passes through IS sieve 40 ( $0.42 \mathrm{~mm}$ opening). The power requirement to crush the material with a feed rate of 3 ton $\mathrm{h}^{-1}$ is $6 \mathrm{~kW}$. Power requirement to crush 2 ton $\mathrm{h}^{-1}$ of the same feed using the above system so that $80 \%$ of the ground feed pass through IS sieve 15 (opening $0.157 \mathrm{~mm}$ ) is ___________$\mathrm{kW}$

In a feed milling plant, it has been observed that $80 \%$ of the feed passes through IS sieve 340 ( $3.25 \mathrm{~mm}$ opening) and $80 \%$ of the ground feed passes through IS sieve 40 ( $0.42 \mathrm{~mm}$ opening). The power requirement to crush the material with a feed rate of 3 ton $\mathrm{h}^{-1}$ is $6 \mathrm{~kW}$. Power requirement to crush 2 ton $\mathrm{h}^{-1}$ of the same feed using the above system so that $80 \%$ of the ground feed pass through IS sieve 15 (opening $0.157 \mathrm{~mm}$ ) is ___________$\mathrm{kW}$

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