Time remaining = 1 - 7/8 = 1/8 hour :
1 hour = 60 minutes : 1 minute = 60 seconds
1/8 hour = 60/8 minutes = 7½ minutes = 7 minutes 30 seconds
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you would change hours to minutes. 1 hour=60 minutes
22:47 is 10:47 PM Subtract 12 from the hours in the 24 hour format to get the 12 hour format.
It is 15/60, which can be simplified, but probably best to see if you need to add or subtract other fractions of an hour before simplifying.
10:30 to 3:30 is five hours.