Cars A and B are traveling towards each other from places A and B at the same time. The speed of car B is (4/5) the speed of car A. The two cars meet at a distance of 15 kilometers from the midpoint. Find the distance between places A and B. km?
甲乙两车分别从A、B两地同时相向而行，乙车的速度是甲车速度的(4/5)，两车在距离中点15千米处相遇，求A、B两地相距多少千米？
<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">5 - 4</gadget>
<output>1</output>

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

<gadget id="calculator">15 * 2 * 9</gadget>
<output>270</output>

<result>270</result>