What formula will compute the number of hours and minutes between the Start Time and the End time in each row?

(Each cell is formatted as number, custom, type: h:mm AM/PM)

Start time End time
12:45 PM 3:14 PM
10:20 AM 12:10 PM
10:20 AM 12:30 PM
9:30 AM 11:30 AM
10:00 AM 12:24 PM
11:20 AM 1:40 PM
11:27 AM 1:42 PM
1:35 PM 3:51 PM
10:30 AM 12:38 PM
11:55 AM 2:05 PM
10:05 AM 12:00 PM
12:00 PM 2:10 PM
10:00 AM 12:50 PM
11:55 AM 1:40 PM
12:45 PM 2:58 PM
12:45 PM 3:13 PM