12 lamp posts are placed along a road at equal distances. The distance between the fourth and the seventh lamp post is 9 m.
- What is the distance between 2 lamp posts?
- What is the distance between the first and the last lamp post?
(a)
Number of intervals between the fourth and the seventh lamp post
= 7 - 4
= 3
Distance between 2 lamp posts
= 9 ÷ 3
= 3 m
(b)
Number of intervals between first and the last lamp post
= 12 - 1
= 11
Distance between the first and the last lamp post
= 11 x 3
= 33 m
Answer(s): (a) 3 m; (b) 33 m