Lynn and Cody started running together along a cross country track. When Cody completed the track in 30 minutes, Lynn had run only
35 of the track. Lynn’s average speed was 104 m/min slower than Cody’s.
- How long was the cross country track in m?
- Find Lynn’s average speed in m/min.
(a)
When Cody completed the track:
Cody's distance = 5 u
Lynn's distance = 3 u
Extra distance covered by Cody
= 5 u - 3 u
= 2 u
2 u = 104 x 30
2 u = 3120
1 u = 3120 ÷ 2 = 1560
Distance of the cross country track
= 5 u
= 5 x 1560
= 7800 m
(b)
Cody's speed
= 7800 ÷ 30
= 260 m/min
Lynn's speed
= 260 - 104
= 156 m/min
Answer(s): (a) 7800 m; (b) 156 m/min