There is a small station every 10 kilometers on the railway line from city A to city B. A slow train runs from city A to city B at a speed of 45 kilometers per hour at 9:00 am, and another express train leaves at 9:30 am. Also drive from city A to city B at a speed of 60 kilometers per hour. The railway department stipulates that the distance between two trains in the same direction should not be less than 8 kilometers. Question: How far should the slow train stop at a small station from City A at the latest, so that the express train can overtake it? How long does the slow train have to wait at least? (The length of fast and slow trains is ignored)
从甲城市到乙城市的铁路线上每隔10千米有一个小车站，一列慢车上午9点整以每小时45千米的速度由甲城市开往乙城市，另一列快车上午9点30分以每小时60千米的速度也从甲城市开往乙城市．铁路部门规定，同方向的两列火车前进时相距不能少于8千米．问：这列慢车最迟应该在距离甲城市多远的小车站停车，让快车超过？慢车至少需要等多长时间？(快、慢车的长度忽略)
<gadget id="calculator">60 + 8</gadget>
<output>68</output>

<gadget id="calculator">68 - 50</gadget>
<output>18</output>

<result>18</result>