# How many times they will toll together ?

Six bells commence tolling together and toll at the intervals of 2, 4, 6, 8, 10, 12 seconds resp. In 60 minutes how many times they will toll together?

- 31
- 21
- 15
- 40

**Answer: (1) 31**

**Explanation:-
**The L C M of 2, 4, 6, 8, 10, 12 = 2 x 2 x 2 x 3 x 5

= 120

Then, 120 sec = 120/60 = 2 min

Six bells tolling together after 2 min

Then, the number of tolling together = 60/2 + 1 = 30 + 1

= 31

Hence, the answer is (1) 31.