At 9 a.m., Cathy and Opal raced off together from the starting point of a path. Cathy ran at an average speed of 3 m/s. Opal ran at an average speed of 4 m/s. Upon reaching the end of the path, Opal rested for 4 minutes. She then immediately ran back along the same route at 4 m/s. At 9.45 a.m., Cathy met Opal.
- 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 9 a.m. to 9.45 a.m. = 45 min
Duration that Cathy ran = 45 min
Duration that Opal ran = 45 - 4 = 41 min
1 min = 60 s
41 min = 41 x 60 = 2460 s
45 min = 45 x 60 = 2700 s
Distance that Cathy ran
= 3 x 2700
= 8100 m
Distance that Opal ran
= 4 x 2460
= 9840 m
Distance that Cathy and Opal ran
= 8100 + 9840
= 17940 m
1000 m = 1 km
17940 m = 17940 ÷ 1000 = 17.94 km
(b)
Length of the trail
= 17.94 ÷ 2
= 8.97 km
Answer(s): (a) 17.94 km; (b) 8.97 km