Two trains A and B depart from A and B at the same time. After a period of time, A travels the whole distance (1/2) and B travels the whole distance (3/5). At this time, the distance between A and B is 80 kilometers. What is the distance between A and B in kilometers?
甲乙两辆火车从A、B两地同时相对开出，一段时间后甲行了全程的(1/2)，乙行了全程的(3/5)，这时甲、乙两车相距80千米，A、B两地的距离是多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(1/2) + (3/5)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">(11/10) - 1</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">80 / (1/10)</gadget>
<output>800</output>

<result>800</result>