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4. Three bells ring together at 8:30a.m. If they ring at the intervals of 4 minutes5 minutes and 6 minutes respectively, then at what time will they ring togethernext?(A) at 8:45 a.m. (B) at 9:30 a.m. (C) at 9:45 a.m. (D) at 10:15 am |
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