A small dirt road has been built for 120 meters, and the full length (2/5) remains unrepaired. How long is this concrete road in meters?
修一条小泥路，已经修了120米，还剩下全长的(2/5)没修．这条水泥路全长多少米？
<gadget id="calculator">2 / 5</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">120 / (3/5)</gadget>
<output>200</output>

<result>200</result>