From 8 o'clock to 20 o'clock, Master Wang processed 360 parts, how many parts per hour on average.
从8时到20时，王师傅加工了360个零件，平均每小时加工多少个零件．
<gadget id="calculator">20 - 8</gadget>
<output>12</output>

<gadget id="calculator">360 / 12</gadget>
<output>30</output>

<result>30</result>