推荐回答（4个）
第一次相遇AB两车共行了1个全程，A车行了1个75千米
第二次相遇AB两车共行了3个全程，A车行了3个75千米，
也就是75×3＝225千米，同时也是1个全程多55千米
所以，甲乙两地的距离是
75×3－55＝170（千米）
够详细了吧！
因为第一次在离A地75千米处相遇，说明A一次行75千米。第二次相遇时共走了3个全程，所以A走了75*3=225千米，再减去55千米就是一个全程。
75*3-55
=225-55
=170（千米）
答：AB相距170千米。
75×3 的意义就是两车共同走完全程一次，甲车行75千米，相遇二次，共走了3个全程。
-55的意义就是甲车与乙车相遇二次后，走了三个全程，甲车走了一个全程多55千米。减去55米不就是全程吗。
假设甲从A地出发:第一次相遇时,两车共行驶了一个AB距离,甲车就行驶了75千米,那么甲乙两车第二次想遇时他们就已经行驶了3个AB间的距离,那么甲车也就行驶了一个AB距离加55千米,也就是是75*3.所以75*3-55=AB距离=170千米
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