Processing 20 parts, 6 hours to complete, the average hourly completion of this batch of parts ((())/(())).
加工20个零件，6小时完成，平均每小时完成这批零件的((())/(()))．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>