Vietnamese students

2 mins 56 secs

11 mins 27 secs

25 mins 48 secs

16 mins 32 secs

21 mins

14 mins 50 secs

25 mins 27 secs

28 mins 51 secs

2 mins 40 secs

7 mins 59 secs

20 mins 7 secs

20 mins 16 secs

23 mins 12 secs

1 min 28 secs

1 min 27 secs

18 mins 34 secs

10 mins 29 secs

11 mins 12 secs

12 mins 24 secs

16 mins 12 secs

14 mins 22 secs

21 mins 34 secs

5 mins 2 secs

1 min 33 secs

13 mins 44 secs

3 mins 21 secs

2 mins 25 secs

2 mins 20 secs

54 secs

1 min 56 secs

33 secs

1 min

33 secs

34 secs

1 min 43 secs

24 secs

1 min 47 secs

2 mins 18 secs

3 mins 6 secs

20 mins 46 secs