The worker, Master Li, needs to process a batch of parts, 60 parts per hour, can it be completed in 3 hours? How many parts should be machined per hour if the task needs to be completed half an hour early?
工人李师傅要加工一批零件，每小时加工60个，3小时可以完成？如果需要提前半小时完成任务，每小时应该加工多少个零件？
<gadget id="calculator">3 - 0.5</gadget>
<output>2.5</output>

<gadget id="calculator">3 / 2.5</gadget>
<output>1.2</output>

<gadget id="calculator">60 * 1.2</gadget>
<output>72</output>

<result>72</result>