The bus departs from Station A to Station B every 5 minutes, and the journey takes 15 minutes. A person rides a bicycle from station B to station A. When he starts off, there is exactly one car that arrives at station B. On the way, he encounters 10 oncoming cars before arriving at station A. When he arrives at the station, there is exactly one car driving from station A. out. Question: How many minutes did it take him to travel from station B to station A?
公共汽车从甲站开往乙站，每5分钟发车一趟，全程要15分钟．有一人从乙站骑自行车去甲站，出发时恰有一辆车到达乙站，在路上他又遇到10辆迎面开来的汽车才到甲站，到站时恰有一辆汽车从甲站开出．问：他从乙站到甲站共用了多少分钟？
<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">11 * 5</gadget>
<output>55</output>

<gadget id="calculator">55 - 15</gadget>
<output>40</output>

<result>40</result>