The road construction team builds a road, and repairs (3/10) kilometers in the first week, and (7/10) kilometers in the second week. At this time, the ratio of the distance between repaired and unrepaired is 2:3. This section of road How many kilometers is the total length?
筑路队修建一条公路，第一周修了(3/10)千米，第二周修了(7/10)千米，这时，已修和未修的路程比是2：3，这段公路全长多少千米？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(3/10) + (7/10)</gadget>
<output>1</output>

<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">1 / (2/5)</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>