12:19
5
students
12:19 
01:18:16
2
21:55
2
05:00
4
19:51
2
07:39
6
35:35
2
01:27:21
8
30:27
17
32:57
3
11:06
3
09:22
2
19:01
14
23:33
3
26:52
7
10:13
2
07:37
3
11:57
4
05:21
5
33:22
2