Alright, so here we have the scene where WarGreymon slashes Machinedramon to bits. I can calc that.
Spoiler:
Sora's 12-years-old in 01, and according to this, the average 12-year-old girl is 1.524m tall.
1.524m/89px=x/42px
x=0.72m
So 0.72m for Numemon's height.
Spoiler:
That green mass is a bunch of Numemon crawling all over Machinedramon. The Numemon I scaled was one of the bigger ones, and it was still actually bit less than 2px. However, as I can't get a decimal value for a vertical length, I'll just low-ball here.
.72m/2px=x/139px
x=50.04m
50.04m for Machinedramon's height.
Spoiler:
Angsizing that shit, we get...
2*atan(304.9/(479/tan(70/2)))=48.045660319198
...56.136m for a distance.
But wait, there's more
ny
Spoiler:
WarGreymon slashes Machinedramon into thirds and reappears quite some distance behind him.
Slash 1
50.04m/300px=x/77.8px
x=13m
Slash 2
50.04m/300px=x/86.16px
x=14.37m
Distance between slashes (that orange line)
50.04m/300px=x/105px
x=17.514m
Distance from Machinedramon
2*atan(300/(478/tan(70/2)))=47.447212617682
56.933m
Total distance
56.136+13+14.37+17.514+56.933=157.953m
That leads one to believe that both Tai and Machinedramon didn't see what WayGreymon did, however...
Spoiler:
...here we see a cut form on Koromon's head which wasn't there before he attacked Machinedramon. This leads one to believe that Machinedramon did in fact react, he just hadn't realized he'd been harmed by WarGreymon's attack. Thus, Tai simply did not see the attack, rather than the both of them.
I think this is basis for human FPS. According to Darth and Flutter, that's 1/100th of a second.
157.953m/(1/100)s=15795.3m/s
or mach 46.5.
Spoiler:

Sora's 12-years-old in 01, and according to this, the average 12-year-old girl is 1.524m tall.
1.524m/89px=x/42px
x=0.72m
So 0.72m for Numemon's height.
Spoiler:

That green mass is a bunch of Numemon crawling all over Machinedramon. The Numemon I scaled was one of the bigger ones, and it was still actually bit less than 2px. However, as I can't get a decimal value for a vertical length, I'll just low-ball here.
.72m/2px=x/139px
x=50.04m
50.04m for Machinedramon's height.
Spoiler:

Angsizing that shit, we get...
2*atan(304.9/(479/tan(70/2)))=48.045660319198
...56.136m for a distance.
But wait, there's more

Spoiler:

WarGreymon slashes Machinedramon into thirds and reappears quite some distance behind him.
Slash 1
50.04m/300px=x/77.8px
x=13m
Slash 2
50.04m/300px=x/86.16px
x=14.37m
Distance between slashes (that orange line)
50.04m/300px=x/105px
x=17.514m
Distance from Machinedramon
2*atan(300/(478/tan(70/2)))=47.447212617682
56.933m
Total distance
56.136+13+14.37+17.514+56.933=157.953m
That leads one to believe that both Tai and Machinedramon didn't see what WayGreymon did, however...
Spoiler:

...here we see a cut form on Koromon's head which wasn't there before he attacked Machinedramon. This leads one to believe that Machinedramon did in fact react, he just hadn't realized he'd been harmed by WarGreymon's attack. Thus, Tai simply did not see the attack, rather than the both of them.
I think this is basis for human FPS. According to Darth and Flutter, that's 1/100th of a second.
157.953m/(1/100)s=15795.3m/s
or mach 46.5.