It is 1.5 hours
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30 minutes is half an hour (1/2 as a fraction. 0.5 as a decimal). Note, there are 60 minutes in 1 hour.
1 hour is 60 minutes. 60 minutes + 30 minutes = 90 minutes
1 hour and 20 minutes is 1.33333 hours.
1 hour + 75 minutes = 2 hours 15 minutes... That's 2.25 hours as a decimal.
It is: 1/12 of an hour or 0.08'3' recurring '3' as a decimal