How do I get enemies to run away from the player?

1st game with students input and it's going great; the game basically works on a "pac man" level. So now, I need to know how to get the ghosts to run away after our pack man eats the big pellet... any sugesstions, links, or videos?

What I last tried...

I thought converting the player in to an "obstacle" would do it, but it doesn't seem to work. Well, at least with a varible method.

Compare X and/or Y, or compare distance() between two objects.

If you use the distance formula, you might also have to do a for each loop because it won't register which enemy you want to run away otherwise.

BurningWood

Depends how you are controlling the ghosts in the first place.

Why not attach a larger, invisible sprite to the player. When the ghosts come into contact just reverse their direction of travel.