Never how far away from a rat?

Never how far away from a rat? 10 feet,20 feet,i can,t remember who said it and where but i,d thought i,d blog this little blighter seeing as it keeps cropping up on the trailcam.They too can travel a lot,up to 2 miles,i know this because some naturalist friends live trapped quite a few,put vegetable dye on their backs,let them go,then found a couple eating food left out a few nights later.They had travelled nigh on 2 miles but then it was winter so i suppose they look around a lot for food then and there was none where they were let go on the top of the downs.All in the interests of science of course.........