help from a teacher

5
2
35:13
17:35
07:59
04:50
28:13
12:09
37:45
16:16
10:16
10:42
28:45
03:05
10:14
05:14
13:25
15:21
26:18
10:01
06:02
06:41
10:39
06:41
08:00
30:07
12:49
27:19
01:02:43
11:16
12:56
41:36
12:46
30:01
05:27
07:58
12:19
15:00
15:38
10:45
11:01
18:34