The road repair team builds a road. The ratio of the repaired to the unrepaired is 1:4 for the first time, and another 40 meters have been repaired. At this time, the repaired accounted for (1/3) of the road. How long is the road? rice?
修路队修一条路，第一次已修的和未修的比是1：4，又修了40米，这时，已修的占这条路的(1/3)，这条路长多少米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + 4</gadget>
<output>5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/3) - (1/5)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">40 / (2/15)</gadget>
<output>300</output>

<result>300</result>