Five bells commence ringing together and rings at intervals of 3, 6, 9, 12 and 15 seconds respectively. In 30 minutes, how many times do they ring together including the first ring?
1
10 times
2
15 times
3
11 times
4
12 times
Five bells commence ringing together and rings at intervals of 3, 6, 9, 12 and 15 seconds respectively. In 30 minutes, how many times do they ring together including the first ring?