Kimberly and Tommy started running together along a cross country track. When Tommy completed the track in 24 minutes, Kimberly had run only
49 of the track. Kimberly’s average speed was 115 m/min slower than Tommy’s.
- How long was the cross country track in m?
- Find Kimberly’s average speed in m/min.
(a)
When Tommy completed the track:
Tommy's distance = 9 u
Kimberly's distance = 4 u
Extra distance covered by Tommy
= 9 u - 4 u
= 5 u
5 u = 115 x 24
5 u = 2760
1 u = 2760 ÷ 5 = 552
Distance of the cross country track
= 9 u
= 9 x 552
= 4968 m
(b)
Tommy's speed
= 4968 ÷ 24
= 207 m/min
Kimberly's speed
= 207 - 115
= 92 m/min
Answer(s): (a) 4968 m; (b) 92 m/min