An interesting question

  • Thread starter tanujkush
  • Start date
  • #1
39
0
Ok so here is a brainteaser, you should get it in your second attempt at the max., else consider yourself poor at math :biggrin:

An ant is in one corner of a cube shaped room. (say one of the bottom corners on the floor). The ant decides to go to the opposite corner on the roof, which would fall on the diagonal of the cube. Unfortunately, the ant cannot fly, else it would have taken the body diagonal route of the cube to reach there. But the ant is most tired, and it wants to take the shortest route possible. Help the ant out!
 

Attachments

Answers and Replies

  • #2
354
0
walk diagonally (at 22.5°) along the floor to the middle of the opposite face and then walk diagonally (at 22.5°) up to the opposite corner. A total walking distance of approximately 2.16 times the length of the cube face.
 
  • #3
39
0
walk diagonally (at 22.5°) along the floor to the middle of the opposite face and then walk diagonally (at 22.5°) up to the opposite corner. A total walking distance of approximately 2.16 times the length of the cube face.
spot on!
 
  • #4
Gib Z
Homework Helper
3,346
5
Have I misunderstood the question? Why not walk diagonally to the corner directly below the End, and then go up. Walking distance is sqrt 2 + 1 times the cube length, approx 2.1415 times the length.
 
  • #5
39
0
Have I misunderstood the question? Why not walk diagonally to the corner directly below the End, and then go up. Walking distance is sqrt 2 + 1 times the cube length, approx 2.1415 times the length.
walking till the midpoint of the opposite face and then straight to the point end gives you a total distance of sqrt((2a)^2+a^2) = sqrt(5)*a = 2.23606a

walking on the bottom diagonal and then straight up to End is a distance of (sqrt(2)+1)*a = 2.414a>2.3606a
 
  • #6
Gib Z
Homework Helper
3,346
5
My bad, something exploded in my brain as I used digits of pi for sqrt 2.
 
  • #7
525
5
If the sides of the cube are unfolded to a flat surface, the ant's shortest path will be a straight line
 
  • #8
39
0
If the sides of the cube are unfolded to a flat surface, the ant's shortest path will be a straight line
thats exactly the logic! i was asked this question as a part of my mathematics aptitude some time before undergrad, and I was stumped at the time
 

Related Threads on An interesting question

  • Last Post
Replies
1
Views
891
  • Last Post
2
Replies
27
Views
3K
  • Last Post
Replies
8
Views
2K
  • Last Post
Replies
15
Views
2K
  • Last Post
2
Replies
28
Views
2K
  • Last Post
Replies
2
Views
2K
Replies
2
Views
25K
Replies
6
Views
6K
Replies
6
Views
479
Replies
1
Views
4K
Top