12 Minutes.
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one and fifth of an hour
1 hour = 60 miutes 1/5 hour = 60/5 = 12 minutes
One fifth (1/5) of an hour is 12 minutes so three fifths (3/5) is 36 minutes.
There are 60 minutes in an hour.Divide that number by 5 and you get 12 minutes each fifth.Multiply one fifth of an hour (12 minutes) by 2 and you get 24 minutes, which is two fifths of an hour.
One hour equals sixty minutes. One fifth of sixty equals 12. 60 + 12 = 72 minutes.