6 2/3 minutes.
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There are 60 minutes in one hour.
One hour is 60 minutes so one and a half hour is 60 + 30=90 minutes
If the question is, How many minutes is one tenth of an hour ? Then,1 hour = 60 minutes1/10 hour = 60/10 = 6 minutes.
There are 20 minutes in one third of an hour.
One third of an hour is 20 minutes.