Jaslyn and Sam started running together along a cross country track. When Sam completed the track in 39 minutes, Jaslyn had run only
35 of the track. Jaslyn’s average speed was 102 m/min slower than Sam’s.
- How long was the cross country track in m?
- Find Jaslyn’s average speed in m/min.
(a)
When Sam completed the track:
Sam's distance = 5 u
Jaslyn's distance = 3 u
Extra distance covered by Sam
= 5 u - 3 u
= 2 u
2 u = 102 x 39
2 u = 3978
1 u = 3978 ÷ 2 = 1989
Distance of the cross country track
= 5 u
= 5 x 1989
= 9945 m
(b)
Sam's speed
= 9945 ÷ 39
= 255 m/min
Jaslyn's speed
= 255 - 102
= 153 m/min
Answer(s): (a) 9945 m; (b) 153 m/min