The engineering team repairs a section of road, and the ratio of the already repaired to the unrepaired is 1:2. If another 1.5 kilometers are repaired, half of the road will be completed. How many kilometers is the total length of this section of road?
工程队修一段公路，已经修好的和未修好的比是1：2，如果再修1.5千米，刚好修完这条公路的一半，这段公路全长多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/2) - (1/3)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1.5 / (1/6)</gadget>
<output>9</output>

<result>9</result>