Question

Three bells ring at intervals of 12, 15 and
18 min, respectively. They started ringing
simultaneously at 9:00 am. What will be
the next time when they all ring
simultaneously?
(1) 10:00 am
(2) 11:00 am
(3) 12:00 pm
(4) 1 :00 pm​

Answer 1

1) 9 am
2) 10 am
3) 12 pm