In 1997, Six Flags Magic Mountain opened Superman: The Escape. The ride is 415' but only reaches up into the 300ft mark (doesn't make it up to the 400' mark) and reaches a max speed of 100mph.
However, in 2000, Cedar Point introduced Millennium Force. With it's 310' tall hill and speeds of 93mph, Cedar Point claimed Millennium Force the worlds tallest, fastest, and longest roller coaster
Now, how can Millennium Force be the tallest and fastest roller coaster in the world when Superman: The Escape is 400' tall and goes 100mph vs. Millennium Force which is 310' and goes 93mph?