At 8 a.m., Cindy and Yen raced off together from the starting point of a path. Cindy ran at an average speed of 2 m/s. Yen ran at an average speed of 3 m/s. Upon reaching the end of the path, Yen rested for 4 minutes. She then immediately ran back along the same route at 3 m/s. At 8.30 a.m., Cindy 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 8 a.m. to 8.30 a.m. = 30 min
Duration that Cindy ran = 30 min
Duration that Yen ran = 30 - 4 = 26 min
1 min = 60 s
26 min = 26 x 60 = 1560 s
30 min = 30 x 60 = 1800 s
Distance that Cindy ran
= 2 x 1800
= 3600 m
Distance that Yen ran
= 3 x 1560
= 4680 m
Distance that Cindy and Yen ran
= 3600 + 4680
= 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