02:41:40
2
teacher
02:41:40 
00:19
5
00:01
12
08:41:40
6
00:04
0
12:33
1
12:12
0
00:01
2
00:11
0
07:31
0
00:08
0
00:07
0
15:04
3
02:08
0
03:12
0
13:57
0
02:42
1
00:05
0
00:09
2
00:07
0