To build a road, the full length (1/3) was built on the first day, and it was exactly half of the repaired by another 120 meters. How long is this road in meters?
修一条路，第一天修了全长的(1/3)，再修120米正好修了一半．这条路全长多少米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</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">120 / (1/6)</gadget>
<output>720</output>

<result>720</result>