Jaslyn and Peter started running together along a cross country track. When Peter completed the track in 37 minutes, Jaslyn had run only
37 of the track. Jaslyn’s average speed was 100 m/min slower than Peter’s.
- How long was the cross country track in m?
- Find Jaslyn’s average speed in m/min.
(a)
When Peter completed the track:
Peter's distance = 7 u
Jaslyn's distance = 3 u
Extra distance covered by Peter
= 7 u - 3 u
= 4 u
4 u = 100 x 37
4 u = 3700
1 u = 3700 ÷ 4 = 925
Distance of the cross country track
= 7 u
= 7 x 925
= 6475 m
(b)
Peter's speed
= 6475 ÷ 37
= 175 m/min
Jaslyn's speed
= 175 - 100
= 75 m/min
Answer(s): (a) 6475 m; (b) 75 m/min