Two ships sail opposite each other from two docks. When they met, the first ship traveled 520 kilometers, and the second ship traveled 48 kilometers less than the first ship. How many kilometers did the second ship travel?
两艘轮船从两个码头相对行驶．相遇时，第一艘轮船行驶了520千米，第二艘比第一艘少行48千米．第二艘轮船行了多少千米？
<result>48</result>