The harvester can harvest 820 square meters of rice in 4 hours. How many hours will it take to harvest 2460 square meters of rice at this speed?
收割机4小时可收820平方米稻谷，用这样的速度收割2460平方米稻谷，需要多少小时？
<gadget id="calculator">820 / 4</gadget>
<output>205</output>

<gadget id="calculator">2_460 / 205</gadget>
<output>12</output>

<result>12</result>