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1 kilocalorie (kcal) = 1000 calories
So, Lúcia is using energy at a rate of 420 kcal/h x 1000 cal/kcal = 420,000 cal/h
To find the rate in calories per minute, we need to convert hours to minutes.
1 hour = 60 minutes
So, Lúcia is using energy at a rate of 420,000 cal/h / 60 min/h = 7,000 cal/min
Therefore, Lúcia is using energy at a rate of 7,000 cal/min while ice skating.