If you want to add those, add the hours and the minutes separately. Then, if you have 60 or more minutes, convert that to hours and minutes - remembering that there are 60 minutes in an hour.
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3 1/2 hours.30 minutes = 30/60 = 3/6 = 1/2 hours
30 minutes is 1/2 or 0.5 hours, so 3 hours 30 minutes is 3.5 hours
1 hour = 60 minutes 2 hours = 120 minutes 3 hours = 180 minutes . . . 10 hours = 600 minutes 10 hours + 30 minutes = 630 minutes
3 hours 40 minutes.
3 hours 30 minutes = 3.5 hours