At 10 a.m., Kylie and Yen raced off together from the starting point of a track. Kylie ran at an average speed of 1 m/s. Yen ran at an average speed of 2 m/s. Upon reaching the end of the track, Yen rested for 6 minutes. She then immediately ran back along the same route at 2 m/s. At 10.50 a.m., Kylie met Yen.
- Find the total distance covered by the two runners when they met each other. Express your answer in km.
- Find the length of the trail in km.
(a)
From 10 a.m. to 10.50 a.m. = 50 min
Duration that Kylie ran = 50 min
Duration that Yen ran = 50 - 6 = 44 min
1 min = 60 s
44 min = 44 x 60 = 2640 s
50 min = 50 x 60 = 3000 s
Distance that Kylie ran
= 1 x 3000
= 3000 m
Distance that Yen ran
= 2 x 2640
= 5280 m
Distance that Kylie and Yen ran
= 3000 + 5280
= 8280 m
1000 m = 1 km
8280 m = 8280 ÷ 1000 = 8.28 km
(b)
Length of the trail
= 8.28 ÷ 2
= 4.14 km
Answer(s): (a) 8.28 km; (b) 4.14 km