Oh, dude, you're really making me do math right now? Like, okay, fine. So, 8 and a half hours is like 8 hours plus half an hour, which is 30 minutes. So, like, 8 and a half hours is 8 hours plus 30 minutes, which equals 510 minutes.
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There are 150 minutes in 2+1/2 hours; there are 60 minutes per hour.
171 minutes * 1 hours/60 minutes = 2.85 hours (or 2 hours and 51 minutes).
There are 60 minutes in 1 hour, so: 60 (minutes in an hour) * 2 (# of hours) = 120 (minutes in 2 hours)
There are 60 minutes in 1 hours. You divide 120 minutes to 60 minutes and you'll get 2 hours. Therefore the answer is 2 hours.
1 2/3 hours = 100 minutes.