Correct Answer - Option 3 : 6:25:30 A.M
Given:
3 bells ring at the time interval of 35, 45 and 105 seconds
Calculation:
Find LCM of 3 bells
⇒ 35 = 5 × 7
⇒ 45 = 32 × 5
⇒ 105 = 3 × 5 × 7
LCM of 3 bells is
⇒ 32 × 5 × 7 = 315 seconds
After converting into minutes we get 5 minutes 15 seconds
So, next time they ring together at 6:25:30 A.M
∴ 3 bells will ring together at 6:25:30 A.M.