11ac1064_ions___Astronomy___Black_Holes__Question
[Date Answered] February 5, 2010 [Questioner (age, location)] Van (California) [Answer] In 2002 it was discovered that the stellar-mass black hole called GRO J1655-40, is moving across space at a rate of 250,000 miles per hour, four times faster than the average velocity of the stars in that galactic neighborhood! More information here. [Question] 
How fast is a black hole?
Quickie Questions - Astronomy - Black Holes