A tractor can cultivate 1200 square meters of land in 3 hours. How many hours does it take a tractor to plow a piece of land that is 80 meters long and 60 meters wide? (Solve with ratio)
一台拖拉机3小时可以耕地1200平方米．一块长80米，宽60米的地，拖拉机几小时才能耕完？(用比例解)
<gadget id="calculator">80 * 60</gadget>
<output>4_800</output>

<gadget id="calculator">4_800 * 3</gadget>
<output>14_400</output>

<gadget id="calculator">14_400 / 1_200</gadget>
<output>12</output>

<result>12</result>