At 7 a.m., Cindy and Olivia raced off together from the starting point of a path. Cindy ran at an average speed of 2 m/s. Olivia ran at an average speed of 4 m/s. Upon reaching the end of the path, Olivia rested for 6 minutes. She then immediately ran back along the same route at 4 m/s. At 7.30 a.m., Cindy met Olivia.
- 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 7 a.m. to 7.30 a.m. = 30 min
Duration that Cindy ran = 30 min
Duration that Olivia ran = 30 - 6 = 24 min
1 min = 60 s
24 min = 24 x 60 = 1440 s
30 min = 30 x 60 = 1800 s
Distance that Cindy ran
= 2 x 1800
= 3600 m
Distance that Olivia ran
= 4 x 1440
= 5760 m
Distance that Cindy and Olivia ran
= 3600 + 5760
= 9360 m
1000 m = 1 km
9360 m = 9360 ÷ 1000 = 9.36 km
(b)
Length of the trail
= 9.36 ÷ 2
= 4.68 km
Answer(s): (a) 9.36 km; (b) 4.68 km