Cars A and B leave opposite cities at the same time from cities A and B. After 7 hours, the ratio of the distance traveled by car A to the distance it has not traveled is 2:3, and car A travels 15 less than car B every hour. km. How many kilometers are there between A and B?
甲、乙两车同时从A、B两城相对开出，经过7小时相遇，相遇时甲车已行的路程与未行的路程比是2：3，甲车每小时比乙车少行15千米．A、B两地相距多少千米？
<gadget id="calculator">2 * 15</gadget>
<output>30</output>

<gadget id="calculator">3 * 15</gadget>
<output>45</output>

<gadget id="calculator">30 + 45</gadget>
<output>75</output>

<gadget id="calculator">75 * 7</gadget>
<output>525</output>

<result>525</result>