At 8 a.m., Winnie and Yen raced off together from the starting point of a path. Winnie 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 3 minutes. She then immediately ran back along the same route at 3 m/s. At 8.40 a.m., Winnie 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 8.40 a.m. = 40 min
Duration that Winnie ran = 40 min
Duration that Yen ran = 40 - 3 = 37 min
1 min = 60 s
37 min = 37 x 60 = 2220 s
40 min = 40 x 60 = 2400 s
Distance that Winnie ran
= 2 x 2400
= 4800 m
Distance that Yen ran
= 3 x 2220
= 6660 m
Distance that Winnie and Yen ran
= 4800 + 6660
= 11460 m
1000 m = 1 km
11460 m = 11460 ÷ 1000 = 11.46 km
(b)
Length of the trail
= 11.46 ÷ 2
= 5.73 km
Answer(s): (a) 11.46 km; (b) 5.73 km