At 11 a.m., Victoria and Roshel raced off together from the starting point of a track. Victoria ran at an average speed of 1 m/s. Roshel ran at an average speed of 3 m/s. Upon reaching the end of the track, Roshel rested for 3 minutes. She then immediately ran back along the same route at 3 m/s. At 11.35 a.m., Victoria met Roshel.

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 11 a.m. to 11.35 a.m. = 35 min

Duration that Victoria ran = 35 min
Duration that Roshel ran = 35 -  3 = 32 min

1 min = 60 s

32 min = 32 x 60 = 1920 s
35 min = 35 x 60 = 2100 s

Distance that Victoria ran
= 1 x 2100
= 2100 m

Distance that Roshel ran
= 3 x 1920
= 5760 m

Distance that Victoria and Roshel ran
= 2100 + 5760
= 7860 m

1000 m = 1 km

7860 m = 7860 ÷ 1000 = 7.86 km

(b)
Length of the trail
= 7.86 ÷ 2
= 3.93 km

Answer(s): (a) 7.86 km; (b) 3.93 km