11 lamp posts are placed along a road at equal distances. The distance between the third and the tenth lamp post is 70 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 third and the tenth lamp post
= 10 - 3
= 7
Distance between 2 lamp posts
= 70 ÷ 7
= 10 m
(b)
Number of intervals between first and the last lamp post
= 11 - 1
= 10
Distance between the first and the last lamp post
= 10 x 10
= 100 m
Answer(s): (a) 7 m; (b) 100 m