Kimberly and Oscar started running together along a cross country track. When Oscar completed the track in 29 minutes, Kimberly had run only
13 of the track. Kimberly’s average speed was 114 m/min slower than Oscar’s.
- How long was the cross country track in m?
- Find Kimberly’s average speed in m/min.
(a)
When Oscar completed the track:
Oscar's distance = 3 u
Kimberly's distance = 1 u
Extra distance covered by Oscar
= 3 u - 1 u
= 2 u
2 u = 114 x 29
2 u = 3306
1 u = 3306 ÷ 2 = 1653
Distance of the cross country track
= 3 u
= 3 x 1653
= 4959 m
(b)
Oscar's speed
= 4959 ÷ 29
= 171 m/min
Kimberly's speed
= 171 - 114
= 57 m/min
Answer(s): (a) 4959 m; (b) 57 m/min