At 7 a.m., Cody started from City G and travelled towards City H and his speed remained constant throughout. At 10 a.m., Julie started her journey from City G towards City H at an average speed of 72 km/h. Julie overtook Cody at 1 p.m. After overtaking, Julie carried on her journey at the same average speed and reached at City H at 3:15 p.m.
- Find Cody's average speed in km/h.
- What is the distance between the two cities?
(a)
From 10 a.m. to 1 p.m. = 3 h
Distance that Julie had travelled until Julie overtook Cody
= 3 x 72
= 216 km
From 7 a.m. to 1 p.m. = 6 h
Cody's average speed
= 216 ÷ 6
= 36 km/h
(b)
From 10 a.m. to 3:15 p.m. = 5 h 15 min
1 h = 60 min
5 h 15 min = 5
15 60
h = 5
14 h
Distance between the two cities
= 5
14 x 72
=
214 x 72
= 378 km
Answer(s): (a) 36 km/h; (b) 378 km