A cement road has been repaired for the full length (3/5), and there is still 720 meters to the end. How long is this cement road in meters?
一条水泥路，已经修了全长的(3/5)，距终点还有720米，这条水泥路全长多少米？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">720 / (2/5)</gadget>
<output>1_800</output>

<result>1_800</result>