Master Li processed a batch of parts, planned to process 36 per hour, and completed the task in 15 hours. The actual processing was completed 3 hours ahead of schedule. How many parts are actually machined per hour?
李师傅加工一批零件，计划每小时加工36个，15小时完成任务，实际加工提前了3小时完成．实际每小时加工多少个零件？
<gadget id="calculator">15 - 3</gadget>
<output>12</output>

<gadget id="calculator">15 / 12</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">36 * (5/4)</gadget>
<output>45</output>

<result>45</result>