I haven't done maths since I dropped it in year 10, but how is anyone actually supposed to do this?
There's nothing to calculate. We don't know how fast they're moving and we don't know long they're moving for. We don't have a map or a scale or anything to measure.
There's a good chance that I'm an idiot and I just don't understand because I haven't done maths in a year and a half, but this is how your question would sound in a classroom:
If it takes John three days to get from x to y, then what is the distance between x and y?
There is surely no way to answer this question.
And if you want me to create my own rule, such as 1 day travel automatically equals 10km, then what's the point of your question since their is no definitive answer?
P.s. sorry if I sound kind of harsh, but no one has replied to this thread yet and I can kinda see why.