Traffic lights at three different road crossings change after 24 seconds, 36 seconds and 54 seconds, respectively. If they all change simultaneously at 10:15:00 a.m., then at what time will they change simultaneously again?
1
10:18:36 a.m.
2
10:32:36 a.m.
3
12:03:00 a.m.
4
01:03:00 p.m.