A tractor plows a piece of land of 6000 square meters, and the total plowing area is 300 square meters in the first 4 hours. According to this calculation, how many hours will it take to finish plowing the land?
拖拉机耕一块6000平方米的地，开始4小时共耕地300平方米，照这样计算，耕完这块地共用多少小时？
<gadget id="calculator">300 / 4</gadget>
<output>75</output>

<gadget id="calculator">6_000 / 75</gadget>
<output>80</output>

<result>80</result>