6 tractors cultivate 4.2 hectares of land in 2.5 hours, how many hectares of land each tractor cultivates per hour on average.
6台拖拉机2.5小时耕地4.2公顷，平均每台拖拉机每小时耕地多少公顷．
<gadget id="calculator">4.2 / 2.5 / 6</gadget>
<output>0.28</output>

<result>0.28</result>