if say 11:30 in morning to 5 in afternoon
then add 1/2 hour to noon, then add 5
0:30 + 5:00 = 5:30
five and a half hours
add 12 if twelve hours later
5 hours.
11:30am - 5:00pm = 5:30 hours 11:30pm - 5:00pm = 17:30 hours
Three hours
3 hours.
7 hours and 30 minutes.
7 hours and 30 minutes.
(7+12k) hours where k is an integer.
3 hours and 50 minutes.
6 hours and 30 minutes.
5.5+24k hours where k is an integer.
One and a half hours (1 hour 30 minutes)
1960