The starting and ending stations of the No. 1 tram are Station A and Station B respectively. A tram departs from Station A to Station B every 5 minutes. The whole journey takes 15 minutes. A person starts from Station B and rides along the tram route. At station A, when he was leaving, a tram happened to arrive at station B. On the way, he encountered 10 oncoming trams before arriving at station A. At this time, another tram happened to leave from station A. How many minutes did it take him to get from station B to station A?
一路电车的起点站和终点站分别是甲站和乙站，每隔5分钟有一辆电车从甲站发出开往乙站，全程要走15分钟，有一个人从乙站出发沿电车路线骑车前往甲站，他出发的时候，恰好有一辆电车到达乙站，在路上他又遇到了10辆迎面开来的电车才到达甲站，这时候恰好又有一辆电车从甲站开出．他从乙站到甲站用了多少分钟．
<gadget id="calculator">12 - 4</gadget>
<output>8</output>

<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<result>40</result>