150 minutes
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3.5 hours.
There are 60 minutes in one hour. Therefore, 3 hours 30 minutes is equal to (3 x 60) + 30 = 210 minutes.
210 minutes is equal to 3.5 hours, or 3 hours and 30 minutes.
I assume 0.5 hours. 0.5 hours is 30 minutes
There are 60 minutes in one hour, so 120 minutes is equal to 2 hours and 150 minutes is equal to 2 hours and 30 minutes (or 2 and 1/2 hours).