There are three buses at the bus station leading to different places. The first bus departs every 5 minutes, the second bus departs every 10 minutes, and the third bus departs every 6 minutes. The third bus departs at the same After the departure time, how many minutes is the minimum time before departure at the same time?
公共汽车站有三路汽车通往不同的地方，第一路车每隔5分钟发车一次，第二路车每隔10分钟发车一次，第三路车每隔6分钟发车一次，三路车在同一时刻发车后，最少走多少分钟再同时发车？
<gadget id="calculator">2 * 3 * 5</gadget>
<output>30</output>

<result>30</result>