Two postmen A and B are traveling towards each other at a constant speed at the same time. When they meet, A travels 18 kilometers longer than B. After meeting, A travels 4.5 hours to reach B, and B travels 8 hours to reach A. Then A, What is the distance between B and B?
甲、乙两邮递员分别A，B两地同时以匀速相向而行，相遇时甲比乙多走18千米，相遇后甲走4.5小时到达B地，乙走8小时到达A地，那么A，B两地的距离是多少．
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