You have two towers with the height of 60m and 30m. The distance between them is 120m. What will be the minimum length of a cable if you need to connect their top while you have to touch the ground. (I tried to draw it as much as i can to make it easy to understand. Its up to you from where you touch the ground)

Edit:Its not appearing as its shown in preview. I had to edit it. "^" is used for blank. Sorry.

l\ 60m
l.\
l..\^^^^^^^^^/l 30m
l...\___________/ l
<---------------->
120m

"What doesn't kill me; makes me stronger..."