A road repairing team has repaired a road, 400 meters have been repaired, and (3/5) of this road has not been repaired. How long is this road in meters?
一个修路队修一条公路，已经修了400米，还剩下这条公路的(3/5)没有修．这条公路全长多少米？
<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">400 / (2/5)</gadget>
<output>1_000</output>

<result>1_000</result>