Tammy and Harry started running together along a cross country track. When Harry completed the track in 30 minutes, Tammy had run only
13 of the track. Tammy’s average speed was 102 m/min slower than Harry’s.
- How long was the cross country track in m?
- Find Tammy’s average speed in m/min.
(a)
When Harry completed the track:
Harry's distance = 3 u
Tammy's distance = 1 u
Extra distance covered by Harry
= 3 u - 1 u
= 2 u
2 u = 102 x 30
2 u = 3060
1 u = 3060 ÷ 2 = 1530
Distance of the cross country track
= 3 u
= 3 x 1530
= 4590 m
(b)
Harry's speed
= 4590 ÷ 30
= 153 m/min
Tammy's speed
= 153 - 102
= 51 m/min
Answer(s): (a) 4590 m; (b) 51 m/min