There is a rice field of 3 square kilometers, and 150,000 square meters are harvested every day with a harvester. How many days will it take to harvest all of them?
有一块3平方千米的稻田，用收割机每天收割150000平方米，一共需要多少天才能全部收割完？
<gadget id="calculator">30_000_000 / 150_000 / 10</gadget>
<output>20</output>

<result>20</result>