exercise 4d question 21 to 28

42:08

12:44

39:49

10:22

8:42

21:05

11:52

5:37

2:35

5:49

12:39

13:20

37:48

42:40

4:30

19:41

39:25

37:45

35:27

28:07

1:02:56

1:09:30

56:16

21:53

31:01

36:33

11:42

10:14

19:50

36:46

6:28

23:32

9:14

29:46

1:16:41

2:42

29:56

7:05

10:21

4:57

20:10

7:56

10:52

2:56

11:00

14:13

5:56

8:28

15:47

5:31

11:42

24:41

4:20

22:47

20:56

46:55

28:22

8:38

32:14

5:10