There is a tram line whose starting and ending stations are Station A and Station B respectively. Every 5 minutes, a tram departs from Station A to Station B, and the journey takes 15 minutes. A person starts from station B and rides a bicycle along the tram route to station A. When he started, there was just a tram arriving at station B. Encountered 10 oncoming trams on the road. When he arrived at Station A, there was another tram leaving from Station A. Ask him how many minutes it took him to get from Station B to Station A?
有一路电车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出发开往乙站，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．他出发时，恰有一辆电车到达乙站．在路上遇到了10辆迎面开来的电车．当到达甲站时，恰又有一辆电车从甲站开出，问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>