Two trains, A and B, depart from stations A and B at the same time and travel toward each other. When they meet, train A travels 100 kilometers longer than train B. Given that the speed of car B is (3/5) that of car A, find the length of the railway between stations A and B. (Click on the idea: when we met, car A traveled the whole distance (5/(5+3)), and car B traveled the whole distance (3/(5+3))).
甲、乙两列火车同时从A、B两站出发相向而行，相遇时，甲车比乙车多行了100千米．已知乙车的速度是甲车的(3/5)，求A、B两站间的铁路长．(思路点击：相遇时甲车行了全程的(5/(5+3))，乙车行了全程的(3/(5+3)))．
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(5/8) - (3/8)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">100 / (1/4)</gadget>
<output>400</output>

<result>400</result>