That would take pro-level power to go that fast up a 27% grade for that long. Likely either the speed, the grade, or the distance is being over-estimated...
+1. - That would take just short of 500 watts for 3 minutes.
22% on Mt. Washington is unbearable. Sprinting, I might go about 8 miles an hour, for about 10 seconds. Then, I'm done.