Three bells toll at intervals of 12, 15 and 18 minutes, respectively. If all the three bells toll together at 8 a.m., when will they toll together next?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 11 a.m..
LCM of 12, 15 and 18 = 180
180 minutes = 3 hours
The bells will toll together at = 8 a.m. + 3 hours = 11 a.m.