Aunt Li works 5 days a week, 8 hours a day. A total of 640 yuan was received. How much does she earn on average per hour?
李阿姨每周工作5天，每天工作8小时．共收人640元．她平均每小时收人多少元？
<gadget id="calculator">640 / 5 / 8</gadget>
<output>16</output>

<result>16</result>