las tres y cuarto de la tarde (quarter past 3, p.m.)
las tres y quince minutos de la tarde (3.15 p.m. - not very usual)
3:30 PM or 15:30 (it depends really)
If it is 3:15 it will be between midnight and noon or am. If it is 15:15 it will be between noon and midnight or pm.
1:15pm
There are 4 hours and 15 minutes, or 4.25 hours, between 3:00 pm and 7:15 pm.
3 hours and 15 min
From 2:37 am to 6:15 am is 3 hours and 38 minutes. From 2:37 am to 6:15 pm is 15 hours and 38 minutes. From 2:37 pm to 6:15 pm is 3 hours and 38 minutes. From 2:37 pm to 6:15 am is 15 hours and 38 minutes.
3 pm is 15 hours, so 15-3 1/2 = 11 1/2 hours or 11:30 hours
3 AM is 03:00. 3 PM is 15:00.
You would basically do something like this 45:3 it would be backwards.
-506
3:15 pm
3:07 pm