Feat happens at around 17:10 in this episode, wherein Majiramon flies from the Digital World to the data wall surrounding the Real World in about 8 seconds.
Spoiler:
The fact that the data wall surrounding the real world actually adds to the dimensions will make this lower than it should be, but oh well.
2*atan(1445/(768/tan(70/2)))=105.599850476096
Put this in the angsize calculator with Earth's diameter, and we get 4835.9km for a distance. However, Majiramon starts somewhere in the sky but below any clouds, so I'll take off 2km for a distance of 4833.9km.
4833900/8=604237.5m/s
or about mach 1777.
Spoiler:
The fact that the data wall surrounding the real world actually adds to the dimensions will make this lower than it should be, but oh well.
2*atan(1445/(768/tan(70/2)))=105.599850476096
Put this in the angsize calculator with Earth's diameter, and we get 4835.9km for a distance. However, Majiramon starts somewhere in the sky but below any clouds, so I'll take off 2km for a distance of 4833.9km.
4833900/8=604237.5m/s
or about mach 1777.
