Hanoi students

2 mins 43 secs

10 mins 1 sec

7 mins 18 secs

4 mins 46 secs

4 mins 11 secs

6 mins 13 secs

2 mins 57 secs

3 mins 42 secs

1 min 32 secs

25 secs

2 mins 9 secs

4 mins

7 mins 52 secs

3 mins 55 secs

1 min 16 secs

52 secs

1 min 28 secs

41 secs

9 mins

19 mins 43 secs

15 mins 53 secs

43 secs

42 secs

1 min 1 sec

3 mins 36 secs

2 mins 31 secs

1 min 13 secs

2 mins 19 secs

52 secs

2 mins 17 secs

2 mins 18 secs

1 min 27 secs

14 secs

2 mins 52 secs

4 mins 52 secs

3 mins 6 secs

47 secs

8 mins 14 secs

2 mins 30 secs

14 mins 36 secs