There are 28 quarter hours in 7 hours. This is because there are 4 quarter hours in each hour, and when you multiply 4 by 7, you get 28. Each quarter hour represents 15 minutes, so 28 quarter hours would equal 420 minutes.
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There are 12 quarter hours in 3 hours, since there are 4 quarter hours in an hour.
8
There are three quarter-hours in 45 minutes.
.25 hours is a quarter of an hour.
Six and a quarter hours.