It is: 24 hours minus 8 hours 15 minutes = 15 hours 45 minutes
4:15 pm
35 minutes before 8
Between 8 am and Noon are 4 hours = 240 minutes. Let T = 240 - x, and T - 60 = 3*x. Where T is right now, T-60 is one hour ago, and x is the number of minutes before noon, and 3*x is the number of minutes after 8am. Substitute the first equation into the second & solve for x: 240 - x - 60 = 3*x --> 180 = 4*x --> x = 45, So it is 45 minutes before noon (11:15), and 1 hour ago (10:15) it was 2 hrs 15 minutes after 8 am (135 minutes), and yes 135 is 3 times 45, so it works.
15 minutes
7:45
8:15 AM
It is 28 minutes from 7:47 AM to 8:15 AM or 7:47 PM to 8:15 PM -- an hour has 60 minutes, so from 7:47 to 8:00 is 13 minutes, and from 8:00 to 8:15 is another 15 minutes.(* from 7:47 AM to 8:15 PM, or from 7:47 PM to 8:15 AM would be another 12 hours, or 720 minutes, making the total 748 minutes)
It is: 24 hours minus 8 hours 15 minutes = 15 hours 45 minutes
The term a quarter to 9 means 15 minutes before 9 o'clock, or 45 minutes after 8 o'clock; it would be written as 8:45.
25 minutes before 8 o'clock is 7:35.
There are: 120/15 = 8 of them
11:15 is 30 minutes before it. 12:15 is 30 minutes after it.
4:15 pm
15% of 8 hours = 15% * 8 = 0.15 * 8 = 1.2 hours or 1 hour 12 minutes
15 miles = 1 hour 1 hour = 60 minutes 60 minutes divided by 15 = 4 minutes per mile 4 minutes times 8 miles = 32 minutes
35 minutes before 8