Cars A and B leave opposite places A and B at the same time. Car A travels 48 kilometers per hour, which is 1/5 slower than car B per hour. Cars A and B are at a distance M kilometers away from the midpoint Meet, find the distance between A and B.
甲、乙两车同时从A，B两地相对开出，甲车每小时行48千米，比乙车每小时慢(1/5)，甲、乙两车在距中点M千米处相遇，求A，B两地距离．
<result>18</result>