Team A, B, and C built a road together. Captain A said: "We have completed half of the entire task." Captain B said: "We have repaired 120 meters." Captain C said: "We have undertaken 30% of the entire project. "Please calculate how long this road is?
甲乙丙三个修路队共修一条公路，甲队长说："我们修了全部任务的一半．"乙队长说："我们修了120米．"丙队长说："我们承担了全部工程的30%．"请你算一算这条路有多长？
<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">120 / (1/5)</gadget>
<output>600</output>

<result>600</result>