🚀 go-pugleaf

In article <1992Sep3.123226.14205@hubcap.clemson.edu> steve@hubcap.clemson.edu ("Steve" Stevenson) writes:
>[I saw this on sci.logic. I thought it was a nice problem for this group.
>  steve]
>>From: dougs@tvnews.tv.tek.com (Doug Stevens)
>>Message-ID: <1992Sep1.234452.26917@tvnews.tv.tek.com>
>
>[....]

Unless I'm missing something, this is fairly straightforward.

1) A zeroes watch, calls B and hangs up.
2) B waits till phone ends ringing then calls A and hangs up.
3) B calls A again and hangs up.
4) A times the first call back, and now knows (AB + BA), when he gets
   the second call back, he now knows BA as well (and therefore AB).
5) A sets his watch back by AB, and calls B
6) B picks up the phone and zeroes his watch, they now have (approximately)
   synchronized watches.
7) Bob's your uncle.


Leo Dagum
NASA Ames Reseach Center