At a certain bus station, Route 5: departs every 30 minutes, Route 6: departs once every 20 minutes, and after a few minutes, the two buses depart at the same time again?
某公交车站，五路：30分钟发一次，六路：20分钟发一次，经过几分钟后两路车再次同时发车？
<gadget id="calculator">2 * 2 * 3 * 5</gadget>
<output>60</output>

<result>60</result>