Three bells are programmed to ring after 4 minutes, 6 minutes, and 10 minutes respectively. If they all rang together at 3.00 p.m , when will they all ring together the next time ?

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• A 5:00 pm
• B 5:30 pm
• C 4:24 pm
• D 4:00 pm

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Answer: D. 4:00 pm

LCM of 4,6 and 10 is 60. So it is 60 minutes . All three bells will ring together after an hour which is at 4:00 pm

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