Four bells toll at intervals of 6, 8, 12 and 16 seconds respectively. They toll together at a certain moment. After how many seconds will they next toll together?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 48 seconds
The bells toll together again after the smallest time that is a multiple of every interval, the LCM of the intervals.
\(6=2\times3\), \(8=2^{3}\), \(12=2^{2}\times3\), \(16=2^{4}\)
LCM \(=2^{4}\times3=48\)
They toll together again after 48 seconds.