Six bells toll in intervals of 2, 4, 6, 8, 10 and 12 seconds respectively. If all start tolling together, how many times will they toll together in 30 minutes?
1
8
2
16
3
15
4
4
Six bells toll in intervals of 2, 4, 6, 8, 10 and 12 seconds respectively. If all start tolling together, how many times will they toll together in 30 minutes?