It is 24 hours.
8am to 8pm = 12 hours.
8pm to 8am = 12 hours.
2 x 12 = 24.
24 hours
12 hours.
24 hours
24
On the same morning there are 3 hours from 8am to 11am
14 hours
3 hours.
Eight hours !
9 hours.
5 hours.
11.25 hours
Three hours !
11 hours
the answer is 12 hours.
15 hours
8 hours