By fps I assume it feet per second,hence
400fps=272.72727288 mph
About 6336 miles per hour (mph)
The 747-400, which is the most common variant in service, has a high-subsonic cruise speed of Mach 0.85-0.855 = up to 570 mph or 920 km/h
60 mi/h * 5280 ft/mi * 1hr/60min * 1min/60sec = 88 fps
Miles per Hour- MPH Feet per second- FPS Kilometers per hour- KPH Feet per hour- FPH
The velocity limit of cast bullets is dependant more on the hardness of the alloy than anything else. The use of gas checks should increase the limit by 300 to 400 fps. I use an alloy of 95% wheel weights and 5% bar solder. My limit is1400 fps for plain base and 1800 fps for gas checks before leading becomes a problem. Cleaning the bore often will help.
1 mph is 1.47 fps
62 mph = 90.933... fps
280 x 3600/5280 = 190.91 mph
3,600/5,280 gives you 1 fps in m.p.h Example: 52.8 f.p.s = 36 m.p.h.
400 feet = 121.92 meters (rounded)
103 mph = 151.067 fps
36.66666666 fps
299.93 fps.
450 FPS BB 400 FPS Pellets
92 mph = 134.93 feet per second
15 fps (feet / second) = 10.23 mph
88 fps = 60 mph 25/11 fps = (60/88 x 25/11) = 0.3 mph