The road repair team builds a road, the ratio of the repaired to the unrepaired is 2:5, and 58 kilometers are repaired, and the repaired is this road (7/10), how many kilometers is this road?
修路队修一条公路，已修的与未修的比是2：5，再修58千米，已修的是这条路的(7/10)，这条路长多少千米？
<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">2 + 5</gadget>
<output>7</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(7/10) - (2/7)</gadget>
<output>29/70 = around 0.414286</output>

<gadget id="calculator">58 / (29/70)</gadget>
<output>140</output>

<result>140</result>