The road repair team repaired a road and built 420 meters in the first 3 days. According to this calculation, the task can be completed in 2 more days. How long is this road?
修路队修一条公路，前3天修了420米，照这样计算，再修2天就能完成任务，这条公路长多少米？
<gadget id="calculator">420 / 3</gadget>
<output>140</output>

<gadget id="calculator">140 * 2</gadget>
<output>280</output>

<gadget id="calculator">420 + 280</gadget>
<output>700</output>

<result>700</result>