Hi,

I am prepare for a interview. The company usually ask trick question. I got a couple of them from friends and would like to ask for advice from you.

1) There are two poles with same height of 50 ft. The two poles are separated from each other 100ft, and there is a string 100ft long whose ends are tied to tops of the poles. Now try to bring the two poles together until the string touches the ground. The question is: when the string touches the ground, how far apart the two poles from each other?

I know it has something to do with geometry :), but already forget the stuff.

Thanks,

assume that the distance between two poles is x. We have a right triangle (???), whose hypotenuse is half of the string and the two legs are the pole and x/2. Since height(the hypotenuse) = 1/2 the string = height(the pole) -> x/2= 0 -> x=0-> QED :)