Two people, A and B, process 54 parts in 3 hours, and A processes 6 more parts in 2 hours than B processes in 3 hours. How many parts does A process per hour?
甲乙两人3小时加工零件54个，甲加工2小时的零件比乙加工3小时的零件多6个，甲每小时加工多少个零件．
<gadget id="calculator">54 + 6</gadget>
<output>60</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">60 / 5</gadget>
<output>12</output>

<result>12</result>