Capt. Mooron wrote:

Speeds haven't been stated, so they can't be assumed to be constant.

Without the speeds you have no position to calc a vector... thus
constant speed must be assumed.

ISTM that speed is unknown, so no assumption can be made.


I believe Bart is having some fun! ;-)
The spanner in the works is idea that it's a round trip.

Without the speeds that determination can neither be assumed nor
denied.

I meant that the wording of the question is such that the unwary might
assume that it is a round trip - which it could be - but it might not be.
The vector can be anything, IOW, so I think he's looking for the name of the
resultant vector, and not its magnitude.


--
Wally
www.artbywally.com
www.wally.myby.co.uk