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A temple has five bells which ring at the intervals of 12, 15, 16, 20, and 25 minutes respectively. If they ring together at midnight, then at what time next will they ring together?
LCM of 12, 15, 16, 20, and 25
LCM = $$2\times2\times2\times2\times3\times5\times5$$ = 1200
60 minutes = 1 hour
1 minutes = $$\frac{1}{60}$$ hour
1200 minutes = $$\frac{1}{60}\times1200$$ hours = 20 hour
So after 20 hours, all the five bells will be ring together.
If they ring together at midnight(12 AM), then after 20 hours at 8 PM these will be rung together.
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