Assuming 24 hour times since no am/pm are present (though I would normally expect two digits for the hour, as in 08:15, etc) - 20 hours 30 mins.
If the question is from 8:15am to 4:45pm (sounds like a plausible working day) then it is 12 hours less at 8 hr 30 min.
8 15 to 4 45 is:
08:15 to 09:00= 45 mins plus
9:00 to 12:00 = 3 hours plus
12:00 to 24:00 = 12 hours plus
00:00 to 04:00 = 4 hours plus
04:00 to 04:45 = 45 mins
Which is 45 min + 3 hr + 12 hr + 4 hr + 45 min = 19 hr 90 min
But 90 min = 1 hr 30, so total is 20 hr 30 min
15
7 hours and 45 mins
6 hours, 45 minutes has passed from 10:00 PM to 4:45 AM.
11:15 am
3 x 15 millilitres = 45 millilitres
1 hour and 15 minutes passed between 4:45 pm and 6:00 pm.
45 hours
15
7 hours and 45 mins
38.25 45*.85=45*(1-.15)=45-6.75=38.25
2 hours and 51 minutes elapsed from 8:45 to 11:36.
-45.
-45.
Yes. He died at 7:45 am, May 15
6 hours, 45 minutes has passed from 10:00 PM to 4:45 AM.
3:45 would be 15:45. the easiest way is on a 24 hour clock, the am stays the same and you add 12 hours if it is pm.
1545 is in military time, which corresponds to 3:45 PM in standard time.