Bus No. 1 of the bus company departs every 10 minutes, and No. 2 bus departs every 15 minutes. If the cars start at the same time for the first time in the morning, how many minutes later will the two cars start at the same time for the second time?
公交公司的1路车每10分钟发一班车，2路车每15分钟发一班车．如果早晨第一次同时发车，那么多少分钟后两车第二次同时发车？
<gadget id="calculator">2 * 3 * 5</gadget>
<output>30</output>

<result>30</result>