It is 24 hours.8am to 8pm = 12 hours.8pm to 8am = 12 hours.2 x 12 = 24.
(20.75 - 9.5) hrs = 11.25 hrs = 11 hrs and 15 min
On the same morning there are 3 hours from 8am to 11am
14 hours
5 hours.
3 hours.
9 hours.
Three hours !
11 hours
8 hours
15 hours
the answer is 12 hours.