At 7 a.m., Tina and Winnie raced off together from the starting point of a track. Tina ran at an average speed of 1 m/s. Winnie ran at an average speed of 3 m/s. Upon reaching the end of the track, Winnie rested for 3 minutes. She then immediately ran back along the same route at 3 m/s. At 7.25 a.m., Tina met Winnie.

1. Find the total distance covered by the two runners when they met each other. Express your answer in km.
2. Find the length of the trail in km.

(a)
From 7 a.m. to 7.25 a.m. = 25 min

Duration that Tina ran = 25 min
Duration that Winnie ran = 25 -  3 = 22 min

1 min = 60 s

22 min = 22 x 60 = 1320 s
25 min = 25 x 60 = 1500 s

Distance that Tina ran
= 1 x 1500
= 1500 m

Distance that Winnie ran
= 3 x 1320
= 3960 m

Distance that Tina and Winnie ran
= 1500 + 3960
= 5460 m

1000 m = 1 km

5460 m = 5460 ÷ 1000 = 5.46 km

(b)
Length of the trail
= 5.46 ÷ 2
= 2.73 km

Answer(s): (a) 5.46 km; (b) 2.73 km