The road construction team builds a road. The ratio of the repaired to the unrepaired is 2:3. After it is known that 400 meters have been repaired, how long is the road?
修路队修一条公路，已修的和未修的比是2：3，已知已修了400米后，这条公路长多少米？
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">400 / (2/5)</gadget>
<output>1_000</output>

<result>1_000</result>