Master Liu needs to process a batch of parts, 40 parts per hour, which can be completed in 3 hours. If the task needs to be completed in 1 hour, how much work efficiency needs to be increased? (Solved using ratio method)
刘师傅要加工一批零件，每小时加工40个，3小时可以完成，如果要提1小时完成任务，工作效率需提高百分之几？(用比例的方法解)
<gadget id="calculator">40 * 3</gadget>
<output>120</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">120 / 2</gadget>
<output>60</output>

<gadget id="calculator">60 - 40</gadget>
<output>20</output>

<gadget id="calculator">20 / 40</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>