To build a road, (1/6) has already been built, and another 600 meters will be repaired, which will just reach the midpoint of this road. How long is this road in meters?
修一条公路，已经修了(1/6)，再修600米，正好修到这条路的中点，这条路长多少米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/2) - (1/6)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">600 / (1/3)</gadget>
<output>1_800</output>

<result>1_800</result>