sorry for the misunderstanding and confusion...I dont really know how to post problems in sqrrt...so heres another shot at it ..hopes this clarifies some things.. (the whole problem is under the sqrrt): sqrt: (4sqrt80 + (4 divided by [9+4sqrrt5])) = a)[4sqrt5]/9 b) 2 c)[4sqrt5+2]/[3+2sqrt5] d) 6 e) ...

Can any one work this out and give a explaination?

A rectangilar wooden crate has inside dimensions 3 meters by 4 meters by 12 meters. What is the length, in meters, of the longest, straight, inflexible rod of negligible diameter that can be placed completely within the crate?

a) 12
b) 12.6
c) 13
d) 19
e) 24