Min and Ian started running together along a cross country track. When Ian completed the track in 22 minutes, Min had run only
47 of the track. Min’s average speed was 111 m/min slower than Ian’s.
- How long was the cross country track in m?
- Find Min’s average speed in m/min.
(a)
When Ian completed the track:
Ian's distance = 7 u
Min's distance = 4 u
Extra distance covered by Ian
= 7 u - 4 u
= 3 u
3 u = 111 x 22
3 u = 2442
1 u = 2442 ÷ 3 = 814
Distance of the cross country track
= 7 u
= 7 x 814
= 5698 m
(b)
Ian's speed
= 5698 ÷ 22
= 259 m/min
Min's speed
= 259 - 111
= 148 m/min
Answer(s): (a) 5698 m; (b) 148 m/min