A mile per second was a measure of velocity defined by calculating how many miles an object could travel in one second.
In explaining to Amelia Earhart how fast warp 9.9 was, Tom Paris stated, "In your terms, that's about four billion miles a second." (VOY: "The 37's")
Based on this number, it can be calculated that the above mentioned warp factor is 21,473 times the speed of light.
External link Edit