Cars A and B start from stations A and B at the same time and travel towards each other. When the two cars met for the first time, car A traveled 150 kilometers. After the two cars arrive at station B and station A respectively, they immediately turn around and return at the same speed. When the two cars meet for the second time, car A is 90 kilometers away from station A. What is the distance in miles between A and B?
甲、乙两车同时从A、B两站出发，相向而行．两车第一次相遇时，甲车行了150千米．两车分别到达B站和A站后，立即掉头原速返回．当两车第二次相遇时，甲车距离A站90千米．A、B两站的距离是多少千米．
<gadget id="calculator">150 * 3</gadget>
<output>450</output>

<gadget id="calculator">450 + 90</gadget>
<output>540</output>

<gadget id="calculator">540 / 2</gadget>
<output>270</output>

<result>270</result>