Gabby and Charlie started running together along a cross country track. When Charlie completed the track in 39 minutes, Gabby had run only
37 of the track. Gabby’s average speed was 112 m/min slower than Charlie’s.
- How long was the cross country track in m?
- Find Gabby’s average speed in m/min.
(a)
When Charlie completed the track:
Charlie's distance = 7 u
Gabby's distance = 3 u
Extra distance covered by Charlie
= 7 u - 3 u
= 4 u
4 u = 112 x 39
4 u = 4368
1 u = 4368 ÷ 4 = 1092
Distance of the cross country track
= 7 u
= 7 x 1092
= 7644 m
(b)
Charlie's speed
= 7644 ÷ 39
= 196 m/min
Gabby's speed
= 196 - 112
= 84 m/min
Answer(s): (a) 7644 m; (b) 84 m/min