A road and bridge engineering company repaired a road, the first time it repaired the full length (2/5), the second time it repaired 20km, and the two times it repaired the full length (3/5). How long is this road in kilometers?
某路桥工程公司修一条公路，第一次修了全长的(2/5)，第二次修了20km，两次共修了全长的(3/5)．这条公路全长多少千米？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

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

<gadget id="calculator">(3/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">20 / (1/5)</gadget>
<output>100</output>

<result>100</result>