A transportation team accepted the task of shipping 560 tons of chemical fertilizers, and shipped 320 tons in 4 days. According to this calculation, how many days will it take for this batch of chemical fertilizers to be shipped?
某运输队接受了装运560吨化肥的任务，4天装运了320吨，照这样计算，这批化肥还需要几天装运完？
<gadget id="calculator">560 - 320</gadget>
<output>240</output>

<gadget id="calculator">320 / 4</gadget>
<output>80</output>

<gadget id="calculator">240 / 80</gadget>
<output>3</output>

<result>3</result>