Bus No. 1 and No. 3 depart from the same starting point. Bus No. 1 departs every 8 minutes, and Bus No. 3 departs every 10 minutes. After the departure at the same time, at least how many minutes must pass before the two buses depart at the same time again.
1路和3路公共汽车在同一起点站发车，1路每隔8分钟发一次车，3路每隔10分钟发一次车，同时发车后，至少过多少分钟两路车才再次同时发车．
<gadget id="calculator">2 * 2 * 2 * 5</gadget>
<output>40</output>

<result>40</result>