An engineering team repaired a section of road. The first phase of the project completed half of the total length, and the second phase of the project repaired 30% of the total length, leaving 600 meters unrepaired. How long is this road in meters?
某工程队修一段公路，第一期工程修了全长的一半，第二期工程修了全长的30%，还剩下600米没有修．这段公路全长多少米？
<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">600 / (1/5)</gadget>
<output>3_000</output>

<result>3_000</result>