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3 hours & 45 minutes
There are 45 minutes in 3/4 of an hour because 3/4 times 60 minutes = 45.
45 minutes.
Forty-five minutes before 4:30 is 3:45. To calculate this, you simply subtract 45 minutes from 4:30, which brings you to 3:45.
2 hours and 45 minutes = 2.75 because 45 minutes is 3/4's of an hour and 3/4=.75