The engineering team built a road, 280 meters on the first day, and the full length (2/5) on the second day, and a total of 580 meters in two days. How long is this road?
工程队修一条路，第一天修了280米，第二天修了全长的(2/5)，两天共修了580米，这条路有多长？
<gadget id="calculator">580 - 280</gadget>
<output>300</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">300 / (2/5)</gadget>
<output>750</output>

<result>750</result>