Dad went to work at 8:00 this morning and left work at 12:00 noon. He specially made 360 parts in total. How many parts does Dad process per hour on average?
爸爸今天早上8：00上班，到中午12：00下班．他一共特制了360个零件．爸爸平均每小时加工多少个零件？
<gadget id="calculator">12 - 8</gadget>
<output>4</output>

<gadget id="calculator">360 / 4</gadget>
<output>90</output>

<result>90</result>