The master craftsman processed a batch of parts. The original plan was to finish in 5 days, but the actual work was 1 day ahead of schedule. The actual work efficiency was much faster than the plan.
老师傅加工一批零件，原计划5天完成，实际比计划提前1天，实际的工作效率比计划快多少．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) - (1/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) / (1/5)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>