No. 7 bus departs every 15 minutes, and No. 6 bus departs every 24 minutes. After the No. 7 and No. 6 cars depart at the same time, how long will it take at least to depart at the same time?
7路汽车15分钟发一次车，6路车24分钟发一次车．7路车和6路车同时出发后，至少再过多长时间会同时发车？
<gadget id="calculator">2 * 2 * 2 * 3 * 5</gadget>
<output>120</output>

<result>120</result>