Is it possible?
Jim and Tom find a long piece of pipe in a vacant lot. It’s big enough so that each boy can just manage to squeeze into it and crawl from one end to the other. If Jim and Tom go into the pipe from opposite ends, is it possible for each boy to crawl the entire length of the pipe and come out the other end?
Click here for the solution
It is easy. First Jim crawls through the pipe in one direction. After he comes out, Tom crawles through it the other way.