There are three consecutive road crossings at which traffic lights change after every 35 seconds, 42 seconds and 90 seconds, respectively. If the lights are set on simultaneously at 8:00:00 hours, then after how much time will they change again simultaneously?
1
7 minutes 20 seconds
2
9 minutes 30 seconds
3
9 minutes 10 seconds
4
10 minutes 30 seconds