Lamp posts were located at an equal distance of 15 m apart from one another, starting from the beginning of the road. Between every 2 lamp posts, there were 2 bushes, planted 5 m apart.
- What was the distance between the first bush and the fourth bush?
- What was the distance between the sixth bush and the tenth bush?
- Given that the stretch of road was 90 m, how many bushes were there?
Lamp post ↔ bush ↔ bush ↔ Lamp post ↔ bush ↔ bush ↔ Lamp post ↔ bush ↔ bush ↔ Lamp post
(a)
Length of each gap
= 15 ÷ 3
= 5
Distance between first and fourth bush
= 4 intervals
= 4 x 5
= 20 m
(b)
Distance between sixth and tenth bush
= 6 intervals
= 6 x 5
= 30 m
(c)
Distance between 2 lamp posts = 15 m
Number of sets of 15 m
= 90 ÷ 15
= 6
Number of bushes
= 6 x 2
= 12
Answer(s): (a) 20 m; (b) 30 m; (c) 12