At 7 a.m., Dana and Zoe raced off together from the starting point of a pathway. Dana ran at an average speed of 2 m/s. Zoe ran at an average speed of 3 m/s. Upon reaching the end of the pathway, Zoe rested for 6 minutes. She then immediately ran back along the same route at 3 m/s. At 7.30 a.m., Dana met Zoe.
- 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 Dana ran = 30 min
Duration that Zoe 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 Dana ran
= 2 x 1800
= 3600 m
Distance that Zoe ran
= 3 x 1440
= 4320 m
Distance that Dana and Zoe ran
= 3600 + 4320
= 7920 m
1000 m = 1 km
7920 m = 7920 ÷ 1000 = 7.92 km
(b)
Length of the trail
= 7.92 ÷ 2
= 3.96 km
Answer(s): (a) 7.92 km; (b) 3.96 km