Question 67455
First, take the box apart and lay it flat on the table (or draw the box):

Next, put the fly its corner and the crumb in its corner.

Now, draw a straight line between the fly and the crumb (shortest distance).

When you do this, you will have a right triangle with a base of 10 meters and a height of 13 meters.  The fly must crawl along the hypotenuse of this triangle which is:

10^2+13^2=(Distance fly travels)^2
100+169=(Distance fly travels)^2
269=(Distance fly travels)^2  Take sqrt of both sides:

16.4 meters=Distance fly travels----------------------ans
I would be interested in knowing the source document for this problem---thanks


Hope this helps-----ptaylor