9... "From that new start point you have to again cover half the distance."

Math guy and an engineer guy at the starting line 100m from a naked woman. Rules are when the whistle is blown they may run half way until the next whistle. Whistle blows and engineer sprints while the math guy just laughs and doesn't run. The starter asks the math guy why he is laughing and not running. The reply is that if one runs half way each time he will never get to the destination.

The starter relates this to the enginner who replys, "For all intents and purposes, I'll get close enough."