Gabby and Mark started running together along a cross country track. When Mark completed the track in 37 minutes, Gabby had run only
59 of the track. Gabby’s average speed was 108 m/min slower than Mark’s.
- How long was the cross country track in m?
- Find Gabby’s average speed in m/min.
(a)
When Mark completed the track:
Mark's distance = 9 u
Gabby's distance = 5 u
Extra distance covered by Mark
= 9 u - 5 u
= 4 u
4 u = 108 x 37
4 u = 3996
1 u = 3996 ÷ 4 = 999
Distance of the cross country track
= 9 u
= 9 x 999
= 8991 m
(b)
Mark's speed
= 8991 ÷ 37
= 243 m/min
Gabby's speed
= 243 - 108
= 135 m/min
Answer(s): (a) 8991 m; (b) 135 m/min