A boy, a girl and a dog are standing together on a long, straight road. Simultaneously, they all start walking in the same direction: The boy at 4 mph, the girl at 3 mph, and the dog trots back and forth between them at 10 mph. Assume all reversals of direction instantaneous.

In one hour, where is the dog and in which direction is he facing?

(In reply to Sit !! Stay !! by Penny)

It would be nice to assume the dog stays for time d, get a solution in terms of d, and take the limit as d approaches zero. Don't look at me to do this, but maybe somebody (Charlie?) will do it.

Posted by Richard on 2004-01-27 14:36:27