Cars A and B leave oppositely from places A and B at the same time. Car A travels 28 kilometers longer than car B per hour. After 6 hours, they meet each other. After meeting, the two cars continue to move forward. After another 3 hours, car A arrives at B. At this time, how many kilometers is the distance between car B and A?
甲、乙两车同时从A、B两地相对开出，甲车比乙车每小时多行28千米，经过6小时相遇，相遇后两车继续前进，又经过3小时，甲车到达B地，这时乙车距A地还有多少千米？
<gadget id="calculator">6 + 3</gadget>
<output>9</output>

<gadget id="calculator">9 * 28</gadget>
<output>252</output>

<result>252</result>