A farm uses three tractors to cultivate 180 acres of land in 5 hours in the morning and 67.5 acres in 2.5 hours in the afternoon. How many acres are cultivated by each tractor in one hour?
某农场使用三台拖拉机耕地，上午5小时耕地180公亩，下午2.5小时耕地67.5公亩，平均每台拖拉机一小时耕地多少公亩？
<gadget id="calculator">67.5 + 180</gadget>
<output>247.5</output>

<gadget id="calculator">5 + 2.5</gadget>
<output>7.5</output>

<gadget id="calculator">247.5 / 7.5 / 3</gadget>
<output>11</output>

<result>11</result>