A highway has been built with a length of 2,800 kilometers, which is (7/10) the length of this road. How many kilometers is the total length of this road?
修一条公路，已经修成2800千米，是这条公路长的(7/10)，这条公路全长多少千米？
<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">2_800 / (7/10)</gadget>
<output>4_000</output>

<result>4_000</result>