1.5 or 1 1/2 hours. which ever you prefer
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Since there are 60 minutes per hour, 90 minutes is equal to 1 hour and 30 minutes.
There are 60 minutes in an hour. Therefore: 90 = 1.5 or 1 hours 30 minutes
an hour equals 60 minutes. therefore, 1.5 hours or 1 1/2 hours are 90 minutes total
60 minutes = 1 hour 90 minutes = 90 / 60 hours = 1.5 hours
1.5 hours is 90 minutes.