There are: 0.0025 times 60 = 3/20 or 0.15 minutes of an hour
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If you mean of an hour then 0.25 of an hour is 15 minutes
1 hour = 60 minutes 1/12 hour = 60/12 minutes = 5 minutes.
1 hour = 60 minutes 0.4 hour = 60 x 0.4 = 24 minutes
1/12 hour = 5 minutes
20 minutes.