Some lamp posts were located at an equal distance of 10 m apart from one another, starting from the beginning of the road.
- What was the distance between the first lamp post and the fourth lamp post?
- What was the distance between the fourth lamp post and the eighth lamp post?
- Given that the stretch of road was 600 m, how many lamp posts were there from the beginning to the end of the road?
(a)
Number of intervals between the first lamp post and the fourth lamp post
= 4 - 1
= 3
Distance between the first lamp post and the fourth lamp post
= 3 x 10
= 30 m
(b)
Number of intervals between the fourth lamp post and the eighth lamp post
= 8 - 4
= 4
Distance between the fourth lamp post and the eighth lamp post
= 4 x 10
= 40 m
(c)
Number of lamp posts for 600 m excluding the first lamp post
= 600 ÷ 10
= 60
Total number of lamp posts from the beginning to the end of the road
= 60 + 1
= 61
Answer(s): (a) 30 m; (b) 40 m; (c) 61