One tractor cultivates (5/7) hectares of land per hour, and 5 tractors work (28/5) hours, how many hectares of cultivated land are there in total?
一台拖拉机每小时耕地(5/7)公顷，5台拖拉机工作(28/5)小时，一共耕地多少公顷？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">28 / 5</gadget>
<output>28/5 = around 5.6</output>

<gadget id="calculator">(5/7) * 5 * (28/5)</gadget>
<output>20</output>

<result>20</result>