How many hours will it take to cultivate 1,500 acres of land with 3 tractors in 4 hours, and 2,000 acres with 5 tractors?
用3台拖拉机4小时可耕地1500公亩，用同样的拖拉机5台耕地2000公亩，需要多少小时？
<gadget id="calculator">2_000 / 5</gadget>
<output>400</output>

<gadget id="calculator">1_500 / 3 / 4</gadget>
<output>125</output>

<gadget id="calculator">400 / 125</gadget>
<output>16/5 = around 3.2</output>

<result>16/5 = around 3.2</result>