4.5 as a mixed number is 4 1/2
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22.5 or 22 and 1/2 is half of 45
45/12 = 15/4 = 3 3/4
So 45 minutes is 3/4 of an hour (60 minutes in an hour, 45/60 simplifies to 3/4). That means the mixed number would be 2 3/4 hours.
Divide 45 by 8 gives you 5 and 5/8
3 and 3/4 hours.