A car is travelling at a uniform speed.
The driver sees a milestone showing a 2-digit number. After travelling for an hour the driver sees another milestone with the same digits in reverse order. After another hour the driver sees another milestone containing the same two digits as in the first one but the two digits separated by a zero(0).

What is the speed of the car?

(In reply to re(2): Divisibility by Nick Hobson)

That makes sense... but please reference (preferably through a hyperlink) the previous work/comment on which you are basing your conclusions (unless you are replying to that very comment, of course).

Posted by SilverKnight on 2003-10-10 16:49:34