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Answer: Gabriel, by 6 seconds

Gabriel: Half a minute = 30 seconds.

Frank: 60 $\times$ 60 = 3600 seconds in 1 hour, so $\frac1{100}$ of an hour = 36 seconds.

Gabriel was 6 seconds faster.



This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.