Two trains depart from city A and city B at the same time. When train A travels 6/10th of the journey, train B travels 80% of the journey. At this time, the distance between the two trains is 530 kilometers. How long is the railway from city A to city B?
两列火车同时从A城和B城相对开出，当甲车行了全程的十分之六时乙车行了全程的80%，这时两车相距530千米．A城到B城的铁路长多少千米？
<gadget id="calculator">6 / 10</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(3/5) + (-1/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">530 / (2/5)</gadget>
<output>1_325</output>

<result>1_325</result>