40% of a road has been repaired, and there are 240 meters left to be repaired. What is the total length of this road? (answer in two ways)
一条路修了40%，还剩240米没有修，这条路全长多少米？(用两种方法解答)
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">240 / (3/5)</gadget>
<output>400</output>

<result>400</result>