Car A and car B drive from point A to point B at the same time. When car A travels 80 kilometers, car B travels the whole distance (2/5). What is the distance between A and B in kilometers?
甲、乙两车同时从A地驶往B地，甲车行了80千米时，乙车行了全程的(2/5)，当甲车行到全程的一半时，乙车已经到达B地，A、B两地相距多少千米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">80 / (2/5) / (1/2)</gadget>
<output>400</output>

<result>400</result>