Three engineering teams, A, B, and C, have jointly built a road. A has repaired 20% of the total length, B has repaired half of the total length, and C has repaired 180 kilometers. How many kilometers is the total length of this road?
甲乙丙三个工程队共同修完了一条公路，甲修了全长的20%，乙修了全长的一半，丙修了180千米，这条公路全长多少千米？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">1 - (1/5) - (1/2)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">180 / (3/10)</gadget>
<output>600</output>

<result>600</result>