Cars A and B leave opposite places at the same time from places A and B. After 3 hours, A travels the whole distance (1/2), and B travels the whole distance (3/5). At this time, the distance between the two cars is 80 Kilometers, what is the distance in kilometers between A and B?
甲、乙两车从A、B两地同时相对开出，3小时后甲行了全程的(1/2)，乙行了全程的(3/5)，这时甲、乙两车相距80千米，问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">(3/5) - 1</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">80 / (1/10)</gadget>
<output>800</output>

<result>800</result>