Jaslyn and Glen started running together along a cross country track. When Glen completed the track in 24 minutes, Jaslyn had run only
47 of the track. Jaslyn’s average speed was 111 m/min slower than Glen’s.
- How long was the cross country track in m?
- Find Jaslyn’s average speed in m/min.
(a)
When Glen completed the track:
Glen's distance = 7 u
Jaslyn's distance = 4 u
Extra distance covered by Glen
= 7 u - 4 u
= 3 u
3 u = 111 x 24
3 u = 2664
1 u = 2664 ÷ 3 = 888
Distance of the cross country track
= 7 u
= 7 x 888
= 6216 m
(b)
Glen's speed
= 6216 ÷ 24
= 259 m/min
Jaslyn's speed
= 259 - 111
= 148 m/min
Answer(s): (a) 6216 m; (b) 148 m/min