A farm uses tractors to plow land, and 3 tractors plow 6 hectares in 4 hours. According to this calculation, how many hectares can be plowed by 5 tractors in 6 hours.
一个农场用拖拉机耕地，3台拖拉机4小时耕6公顷，照这样计算，5台拖拉机6小时可以耕地多少公顷．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) * 6 * 5</gadget>
<output>45/2 = around 22.5</output>

<result>45/2 = around 22.5</result>