alleryBells ring every 12, 15 and 20 minutes and ring together at 9:00 AM. When will they next ring together?
A9:30 AM
B10:00 AM
C9:45 AM
D10:15 AM
Answer & Solution
Correct answer: B. 10:00 AM
The LCM of 12, 15 and 20 is 60 minutes, so they next coincide one hour later.
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