11:27
36
student
11:27 
05:32
9
12:06
4
09:28
5
30:01
7
13:33
6
11:35
1
11:54
3
35:44
4
05:13
0
11:07
18
13:39
22
07:33
2
07:33
2
06:40
1
06:40
5
20:40
4
10:03
0
10:03
6
14:29
5
