Question

three bells rings at intervals of 30min, 40min and 48min. The bells rang at 1230h.What time, in a. m/p.m, will they ring together next?
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Answer 1

The lowest common multiple of 30, 40 and 48 is 240
The bells will ring together in 240 mins = 4 hours ie at 1630 or 4:30pm