Android : Differentiate ArrayList

My app deals with itineraries and distances between cities. Because some itineraries match with more than one cities, an ArrayListArrayListString is creating with duplicate items-itineraries. Few lines below i need to assign distances to that duplicate itineraries. Here comes the problem...I can't assign different distances to that duplicate objects. I thought that different position differentiates those duplicate items...Is there any way to differentiate them; I tried with ArrayListHashmapString with no results. Any idea;