The road repair team built (2/5) kilometers of roads in the first week, and (11/35) kilometers in the second week. They just repaired (2/7) of the whole field in two weeks. How many kilometers is this road?
修路队第一周修路(2/5)千米，第二周修路(11/35)千米，两周正好修了全场的(2/7)，这条路长多少千米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">11 / 35</gadget>
<output>11/35 = around 0.314286</output>

<gadget id="calculator">(2/5) + (11/35)</gadget>
<output>5/7 = around 0.714286</output>

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

<gadget id="calculator">(5/7) / (2/7)</gadget>
<output>5/2 = around 2.5</output>

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