Three bells ring at intervals of 12, 15 and 18 seconds respectively. – InterviewSolution

1.	Three bells ring at intervals of 12, 15 and 18 seconds respectively. If they starts ringing togetherat 8:35 A. M. at what time will they ring togetheronin at the earliest ?
Answer» 180 is COMMON in 12, 15 and 18. Therefore, LCM of 12, 15 and 18 is 180. Given : They started ringing together at 8:35 a.m. SECOND TIME they ringing together = 8:35 + 180 SECONDS = 8:35 + 3 minutes = 8.38 a.m.

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