Kimberly and Cody started running together along a cross country track. When Cody completed the track in 36 minutes, Kimberly had run only
13 of the track. Kimberly’s average speed was 104 m/min slower than Cody’s.
- How long was the cross country track in m?
- Find Kimberly’s average speed in m/min.
(a)
When Cody completed the track:
Cody's distance = 3 u
Kimberly's distance = 1 u
Extra distance covered by Cody
= 3 u - 1 u
= 2 u
2 u = 104 x 36
2 u = 3744
1 u = 3744 ÷ 2 = 1872
Distance of the cross country track
= 3 u
= 3 x 1872
= 5616 m
(b)
Cody's speed
= 5616 ÷ 36
= 156 m/min
Kimberly's speed
= 156 - 104
= 52 m/min
Answer(s): (a) 5616 m; (b) 52 m/min