Three bells ring at intervals of 48,60 and 72 mins, If they start ringing together after how much time will the next sing togother?
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The answer will be the LCM of the intervals after which they ring.
So, LCM of 48, 60 and 72 will be 360.
So, after 360 minutes or 6 hours they will ring together, provided all are started at the same time.
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