Gabby and Ryan started running together along a cross country track. When Ryan completed the track in 28 minutes, Gabby had run only
47 of the track. Gabby’s average speed was 111 m/min slower than Ryan’s.
- How long was the cross country track in m?
- Find Gabby’s average speed in m/min.
(a)
When Ryan completed the track:
Ryan's distance = 7 u
Gabby's distance = 4 u
Extra distance covered by Ryan
= 7 u - 4 u
= 3 u
3 u = 111 x 28
3 u = 3108
1 u = 3108 ÷ 3 = 1036
Distance of the cross country track
= 7 u
= 7 x 1036
= 7252 m
(b)
Ryan's speed
= 7252 ÷ 28
= 259 m/min
Gabby's speed
= 259 - 111
= 148 m/min
Answer(s): (a) 7252 m; (b) 148 m/min