help from a teacher

5
2
04:50
35:13
16:16
08:25
28:45
17:35
12:56
07:59
30:39
12:49
30:01
15:21
10:42
10:14
28:13
39:40
06:15
10:16
12:56
26:18
13:25
06:00
12:12
11:45
05:56
11:16
41:36
19:13
05:27
30:07
41:05
05:59
09:00
09:40
07:59
10:45
03:05
08:06
10:02
06:41