Two people, A and B, respectively drive from point A to point B. Car A travels 60 kilometers per hour, and car B travels 45 kilometers per hour. When car A arrives at point B, it immediately returns on the same road and meets car B at a distance of 90 kilometers from point B. What is the distance between A and B in miles?
甲乙二人分别从A地开往B地，甲车每小时行60千米，乙车每小时行45千米．甲车到达B地后立即原路返回，在距B地90千米处与乙车相遇．A、B两地相距多少千米．
<gadget id="calculator">60 - 45</gadget>
<output>15</output>

<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">90 * (2/15) * 45</gadget>
<output>540</output>

<gadget id="calculator">540 + 90</gadget>
<output>630</output>

<result>630</result>