The engineering team repairs a section of road, and when it is completed (3/4), it has already exceeded the midpoint of 320 kilometers. How long is this road in kilometers?
工程队修一段公路，当修完全长的(3/4)，已经超过中点320千米．这段公路全长多少千米？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(3/4) - (1/2)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">320 / (1/4)</gadget>
<output>1_280</output>

<result>1_280</result>