6 tractors can cultivate 2160 mu of land in 12 hours, how many mu per hour on average? (calculated in two ways)
6台拖拉机12小时耕地2160亩，平均每小时每台耕多少亩？(用两种方法计算)
<gadget id="calculator">2_160 / 6 / 12</gadget>
<output>30</output>

<result>30</result>