Cars A and B start from places A and B at the same time and drive toward each other. After 8 hours, they meet. After meeting, the two cars continue to move forward. Since car A travels 15 kilometers per hour, after another 5 hours, the two cars meet at the same time. To reach their respective destinations, find the distance between A and B.
甲、乙两车同时从A、B两地出发相向而行，经过8小时相遇，相遇后两车继续前行，由于甲车每小时多行15千米，这样又经过5小时，两车同时到达各自目的地，求A、B两地的距离．
<gadget id="calculator">8 + 5</gadget>
<output>13</output>

<gadget id="calculator">8 / 13</gadget>
<output>8/13 = around 0.615385</output>

<gadget id="calculator">5 / 13</gadget>
<output>5/13 = around 0.384615</output>

<gadget id="calculator">(8/13) - (5/13)</gadget>
<output>3/13 = around 0.230769</output>

<gadget id="calculator">8 / (3/13)</gadget>
<output>104/3 = around 34.666667</output>

<gadget id="calculator">15 * (104/3)</gadget>
<output>520</output>

<result>520</result>