A road has traveled the full length (2/5) and is 14 kilometers away from the midpoint. How many kilometers is the total length of this road?
一条公路，走了全长的(2/5)，离中点还有14千米，这条公路的全长有多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/2) - (2/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">14 / (1/10)</gadget>
<output>140</output>

<result>140</result>