- A1
- B2
- C3
- D4
Step-by-Step Solution
They ring together every LCM(9,12,15) minutes. , LCM = minutes = 3 hours. In the next 3 hours they ring together once, exactly at 12:00 noon.
Answer: A) 1
Three bells in a school ring at intervals of 9, 12 and 15 minutes.
They all ring together at 9:00 am.
How many times in the next 3 hours (from 9:00 am up to and including 12:00 noon) will they ring together again?
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