
Suppose an arrow was fired at a knight from 100 meters away. This arrow moves ten times as fast as the knight. As soon as it is fired, the courageous knight turns around and runs away. Once the arrow gets to where the knight is standing, 100 meters from where it was fired, the knight will have moved away 10 meters. Once the arrow travels that extra 10 meters to strike the knight, the knight will again have evaded it by moving 1 meter away. Once the arrow travels that extra distance, the knight will have moved yet another decimeter. The arrow will move a decimeter; the knight will move a centimeter, and then a millimeter, and then 0.1 of a millimeter, then 0.01 of a millimeter, and eventually into the picometer range. So, if this is true, how can the arrow possibly ever reach the knight? 
