Elapsed time from 2:25 to 5:15: 5:15 - 2:25 = 2 hours and 50 minutes
Elapsed time from 4:45 to 7:45: 7:45 - 4:45 = 3 hours
Elapsed time from 5:35 to 12:20: 12:20 - 5:35 = 6 hours and 45 minutes
Elapsed time from 10:20 to 1:00: Since the ending time is earlier than the starting time, we need to add 12 hours to the ending time to get the elapsed time. 1:00 + 12:00 = 13:00 13:00 - 10:20 = 2 hours and 40 minutes
Elapsed time from 9:25 to 11:40: 11:40 - 9:25 = 2 hours and 15 minutes