To build a road, 35% of the whole journey has been built, and there are still 2.4 kilometers away from the midpoint. How many kilometers have been repaired?
修一条公路，已经修了全程的35%，离中点还有2.4千米，求已经修了多少千米？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">(1/2) - (7/20)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">2.4 / (3/20)</gadget>
<output>16</output>

<gadget id="calculator">16 * (7/20)</gadget>
<output>28/5 = around 5.6</output>

<result>28/5 = around 5.6</result>