Worker Master Wang made machine parts by hand, and made 18 pieces in 0.6 hours. The worker Master Li adopts mechanized operations, and the work efficiency is 4.6 times that of Master Wang. How many machine parts does Master Li make per hour?
工人王师傅手工制作机器零件，0.6小时制作了18个．工人李师傅采用机械化作业，工效是王师傅的4.6倍．李师傅每小时制作多少个机器零件？
<gadget id="calculator">18 / 0.6</gadget>
<output>30</output>

<gadget id="calculator">30 * 4.6</gadget>
<output>138</output>

<result>138</result>