ch 8 example 7 maths 9

6:26

13:42

12:40

11:24

50:00

25:35

43:22

5:40

7:24

1:05:39

11:55

11:10

11:38

7:08

9:57

9:13

4:58

12:49

29:53

1:12:13

9:33

41:32

7:02

6:19:05

8:51

9:08

22:31

1:04:10

16:54

55:33

6:40

1:08:43

5:37

46:53

15:17

46:42

10:15

26:46

7:59

8:47

4:36

5:57

16:16

1:05:09

15:10

6:04

5:12

17:23

42:55

14:11

6:27

13:43

1:14:55

4:57

6:46

5:34:11

2:34

57:34

1:02:45

9:20