Joelle and Seth started running together along a cross country track. When Seth completed the track in 32 minutes, Joelle had run only
35 of the track. Joelle’s average speed was 96 m/min slower than Seth’s.
- How long was the cross country track in m?
- Find Joelle’s average speed in m/min.
(a)
When Seth completed the track:
Seth's distance = 5 u
Joelle's distance = 3 u
Extra distance covered by Seth
= 5 u - 3 u
= 2 u
2 u = 96 x 32
2 u = 3072
1 u = 3072 ÷ 2 = 1536
Distance of the cross country track
= 5 u
= 5 x 1536
= 7680 m
(b)
Seth's speed
= 7680 ÷ 32
= 240 m/min
Joelle's speed
= 240 - 96
= 144 m/min
Answer(s): (a) 7680 m; (b) 144 m/min