Bus No. 1 and No. 2 depart from the starting station at 7 am at the same time. Bus No. 1 departs every 12 minutes, and Bus No. 2 departs every 15 minutes. When is the second simultaneous departure of bus No. 1 and No. 2?
1路和2路公共汽车早上7时同时从起始站发车，1路车每12分钟发一辆车，2路车每15分钟发一辆车．1路和2路公共汽车第二次同时发车是什么时间？
<result>8</result>