a nice olympiad question

17:47

17:47

8:56

8:56

7:13

7:13

6:12

6:12

29:02

1:30

1:29

2:12

13:48

3:36

14:17

1:09

10:00

1:32

3:36

8:05

1:30

20:46

2:03

1:42

کوتاه

15:45

10:02

1:57

3:44

9:09

3:51

2:12

10:16

7:48

15:08

کوتاه

1:42

2:04:50

7:59

10:00