That depends what it is a fraction of.
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11 hours : 3 days = 11 hours : 72 days = 11:72. As a fraction, that is 11/72
To determine what fraction of the day is 9 hours, we first need to establish how many hours are in a day. Since a day consists of 24 hours, we can express 9 hours as a fraction of the day by dividing 9 by 24. This simplifies to 3/8. Therefore, 9 hours is 3/8 or three-eighths of a day.
5 hours 45 mins= 5 3/4 hours= 23/4 hours
3 hours is 1/8 of a full day. 3 hours divided by 24 (hours in a day) = 3/24 = 1/8 (This could vary with the number of hours in the "day" you are considering: a full day, day as opposed to night, or a work day.)
45 minutes is 3/16 of 4 hours.