The school held a jumping competition. Within 5 minutes, Liu Li jumped 480 times and Zhang Hua jumped 420 times. On average, how many times does Liu Li dance more than Zhang Hua per minute?
学校举行跳蝇比赛．在5分钟之内，刘丽共跳了480下，张华跳了420次．平均每分钟刘丽比张华多跳多少下？
<gadget id="calculator">480 - 420</gadget>
<output>60</output>

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

<result>12</result>