This clock puzzle is about the time between strikes, not simply doubling the total time.
If a clock strikes 6 times, there are only 5 intervals between those strikes. If those 5 intervals take 5 seconds, each interval lasts 1 second.
To strike 12 times, there are 11 intervals.
Answer: 11 seconds.
The common mistake is to double 5 seconds and say 10. But the number of gaps between strikes is always one less than the number of strikes.
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