Three road construction teams A, B, and C work together to complete a road. Team A has completed half of the entire task, team B has completed 240m, and team C has completed 30% of the total length. What is the total length of this road in meters?
甲、乙、丙三个修路队共同修完一条公路．甲队完成了全部任务的一半，乙队完成了240m，丙队完成了全长的30%，请问这条公路全长多少米？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (1/2) - (3/10)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">240 / (1/5)</gadget>
<output>1_200</output>

<result>1_200</result>