Master Li started working from 8:00 to 17:00, producing a total of 351 parts. How many parts does Master Li produce on average per hour?
李师傅从8：00开始工作到17：00结束，一共生产351个零件．李师傅平均每小时生产零件多少个？
<gadget id="calculator">351 / 9</gadget>
<output>39</output>

<result>39</result>