Which graph represents a bike traveling at a constant rate of
12 miles per hour?
30
40
27
36
24
32
21
42
28
42
18
36
24
36
地圖
15
30
20
30
12
24
16
24
9
18
12
18
6
12
8
12
3
6
4
6
1
1
Hours
2
Hours
12
Hours
Hours
