Today there are two ports, A and B, and A is 60 kilometers upstream of B. Ships A and B set off from ports A and B at the same time, and both sail upstream. When boat A set out, an object fell into the water, floated on the surface of the water, and drifted downstream with the current. After sailing for a while, Ship A turned around and chased the objects that fell into the water. When ship A catches up with the falling objects, it happens to meet ship B. It is known that ship A and ship B travel at the same speed in still water, and this speed is 6 times the speed of water. When Ship A turns around, how many kilometers has Ship A sailed?
今有A、B两个港口，A在B的上游60千米处．甲、乙两船分别从A、B两港同时出发，都向上游航行．甲船出发时，有一物品掉落水中，浮在水面，随水流漂往下游．甲船出发航行一段后，调头去追落水的物品．当甲船追上落水物品时，恰好和乙船相遇．已知甲、乙两船在静水中的航行速度相同，且这个速度为水速的6倍．当甲船调头时，甲船已航行多少千米．
<result>25</result>