24:01
4
students
24:01 
22:41
4
13:58
1
21:43
14
50:44
2
09:41
1
28:58
6
10:00
4
12:19
1
53:43
12
32:17
3
43:44
14
27:35
1
27:38
3
31:06
4
16:02
1
16:08
5
16:22
3
17:21
4
15:55
3
02:53:30
11
16:14
3
31:16
5
32:50
2
26:31
3
41:41
3
12:00
1
53:54
5
02:34:40
4
58:54
3