In My Hero Academia, Iida uses his Recipro Burst to blitz Izuku's team. I'll be calculating how fast he moved here.
Calculation[]
Izuku height = 392px (1.66m)
Team Midoriya's height = 527.11 (2.2321494898 m)
Team Midoriya's height = 27.17px (2.2321494898 m)
Distance Iida covered = 146px (12.77 m)
Present Mic stated that this happened too fast for the human eye to track, not only that, Izuku is in the same position as he was before Iida blitzed him, after he got blitzed, which implies he likely couldn't perceive it. According to this article, the human eye can also perceive things in 13 milliseconds. That will be our timeframe.
Speed = 12.77/0.013 = 982.30 m/s.
Final Tally[]
Iida's Recipro Burst = Mach 2.82 or Supersonic+