Context in Episode 7 Part I, from 13:02 to 13:44
Scaling[]
Goemon's head = 99 pixels (White Line) = 22.5 cm
Goemon's arm = 71+99 pixels (Yellow Line) = 22.5*(170/99) = 38.6363636 cm or 0.386363636 m
Zantetsuken = 347 pixels (Blue Line) = 22.5*(347/99) = 78.8636364 cm or 0.788636364 m
Fujiko's head = 103 pixels (Red Line)
Fujiko's height = 167 cm
Human head's average ratio is between 1 to 6.5 and 1 to 8.
Fujiko's head = 167/8 = 20.875 cm or 0.20875 m
Panel's height = 550 pixels (Green Line)
2*atan(103/550/0.7) = 0.522821075 rad or 29.955441 degree
http://www.1728.org/angsize.htm
Distance between Fujiko and Goemon = 0.39014 m
Calculations[]
0.386363636+0.788636364 = 1.175 m
Circumference = 2*pi*(1.175) = 7.38274274/2 = 3.69137137 m
MP 40's muzzle velocity = 400 m/s
Timeframe = 0.39014/400 = 0.00097535 seconds
Speed = 3.69137137/0.00097535 = 3784.66332 m/s or Mach 11.0340038
Result[]
Mach 11.034 = Hypersonic+