Master Li processes 320 parts. He starts work at 8:00 am and finishes all processing by 4:00 pm. How many parts does Master Li process per hour on average?
李师傅加工320个零件，上午8：00开始工作，到下午4：00全部加工完，李师傅平均每小时加工多少个零件？
<gadget id="calculator">16 - 8</gadget>
<output>8</output>

<gadget id="calculator">320 / 8</gadget>
<output>40</output>

<result>40</result>