Peter;

I have to give you the same advice I gave to the Jax. Re-read the
question. There aren't any distances given. The distance is a creation
of your own mind. Only time and directions were stated. The start and
the finish, in the problem, were different. The question, IN THE
PROBLEM. was what the line drawn (vector) between these two locations
(start & finish) was called. An Analytical Geometry Solution to a
navigational readings.

There are no distances asked for. There are no directions asked for.

The question; Name the line indicating the difference!!

Is that such a great PROBLEM? Can all the great minds, that have elected
to discuss this problem, admit they are looking for something other than
what was asked for! Don't be misled by Jax's ramblings ( He's caught in
the Gulf Stream again )

Ole Thom