15 lamp posts are placed along a road at equal distances. The distance between the eighth and the eleventh lamp post is 12 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 eighth and the eleventh lamp post
= 11 - 8
= 3
Distance between 2 lamp posts
= 12 ÷ 3
= 4 m
(b)
Number of intervals between first and the last lamp post
= 15 - 1
= 14
Distance between the first and the last lamp post
= 14 x 4
= 56 m
Answer(s): (a) 3 m; (b) 56 m