The distance between two stations A and B is less than 500 kilometers. Two trains A and B leave opposite to each other. Train A stops at a distance of 210 kilometers and train B stops at a distance of 270 kilometers. At this time The distance between the two cars is exactly (1/9) of the distance between A and B. What is the distance between A and B?
甲、乙两站相距不到500千米，A、B两列火车从甲、乙两站相对开出，A车行至210千米处停车，B车行至270千米处停车，这时两车相距的正好是甲、乙两站距离的(1/9)，甲、乙两站的距离是多少？
<gadget id="calculator">210 + 270</gadget>
<output>480</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">1 + (1/9)</gadget>
<output>10/9 = around 1.111111</output>

<gadget id="calculator">480 / (10/9)</gadget>
<output>432</output>

<result>432</result>