There are 60 minutes in one hour. Therefore, 2.25 hours is equal to 2.25 x 60 = 135 minutes.
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3 hours & 45 minutes
1 hour = 60 minutes so 3 hours = 60*3 = 180 minutes. Therefore 3 hours and 45 minutes = 180 + 45 = 225 minutes. 1 minute = 60 seconds so 225 minutes = 60*225 = 13500 seconds.
3 minutes 45 seconds = 225 seconds 2 hours 30 minutes = 9000 seconds So it goes in 9000/225 = 40 times
61/4 hours =375 minutes. you have to divide 60(1hour) into 375 then that will give you the answer.
Just multiply it by 60 to change into minutes and if you mean 3 and 3/4 hours then there are 225 minutes