When Xiaoli is playing, she finds that the local buses have the following characteristics: at a certain bus station, bus No. 1 departs every 12 minutes, bus No. 2 departs every 15 minutes, and bus No. 3 departs every 20 minutes. In the morning, the three vehicles leave the station at the same time, can you help Xiaoli calculate: at least how long does it take for the three vehicles to leave the station at the same time?
小丽在游玩时发现当地的公共汽车有下面特点：某公共汽车站，1路车每12分钟发车一次，2路车每15分钟发车一次，3路车每20分钟发车一次．早晨这三路车辆同时出站，你能帮小丽算一算：至少经过多长时间，这三路车又同时出站？
<gadget id="calculator">5 * 2 * 2 * 3</gadget>
<output>60</output>

<result>60</result>