Two teams jointly build a road. The first team built 50% of the total length, and the second team built 420 kilometers. At this time, the two teams repaired 380 kilometers less than the total length (2/3). The total length of the road is How many kilometers?
两队合修一条路，第一队修了全长的50%，第二队修了420千米，这时两队修的比全长的(2/3)少380千米，这条路全长多少千米？
<gadget id="calculator">420 + 380</gadget>
<output>800</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(2/3) - (1/2)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">800 / (1/6)</gadget>
<output>4_800</output>

<result>4_800</result>