12 lamp posts are placed along a road at equal distances. The distance between the seventh and the eleventh lamp post is 40 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 seventh and the eleventh lamp post
= 11 - 7
= 4
Distance between 2 lamp posts
= 40 ÷ 4
= 10 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 10
= 110 m
Answer(s): (a) 4 m; (b) 110 m