Three bells toll at intervals of 36 sec, 40 sec and 48 sec respectively. They start ringing together at a particular time. They next toll together after
(A) 6 minutes
(B) 12 minutes
(C) 18 minutes
(D) 24 minutes
(A) 6 minutes
(B) 12 minutes
(C) 18 minutes
(D) 24 minutes
Answers & Comments
Answer: B
Explanation:
The LCM (least common multiple) of 36, 40, and 48 is 720. 720/60 = 12 minutes, so the answer is B.