To build a road, the full length (4/5) has been built, and the unrepaired one is 28 kilometers shorter than the one that has been built. How many kilometers is the total length of this road?
修一条公路，已经修了全长的(4/5)，未修的比已修的少28千米，这条公路全长多少千米？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(4/5) - (1/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">28 / (3/5)</gadget>
<output>140/3 = around 46.666667</output>

<result>140/3 = around 46.666667</result>