Shiyun and Flynn started running together along a cross country track. When Flynn completed the track in 20 minutes, Shiyun had run only
13 of the track. Shiyun’s average speed was 96 m/min slower than Flynn’s.
- How long was the cross country track in m?
- Find Shiyun’s average speed in m/min.
(a)
When Flynn completed the track:
Flynn's distance = 3 u
Shiyun's distance = 1 u
Extra distance covered by Flynn
= 3 u - 1 u
= 2 u
2 u = 96 x 20
2 u = 1920
1 u = 1920 ÷ 2 = 960
Distance of the cross country track
= 3 u
= 3 x 960
= 2880 m
(b)
Flynn's speed
= 2880 ÷ 20
= 144 m/min
Shiyun's speed
= 144 - 96
= 48 m/min
Answer(s): (a) 2880 m; (b) 48 m/min