200 kph

Her teleportation could only travel about eighty meters at a time, but she could teleport
again upon reaching each point allowing her to quickly travel long distances. If you
converted it into a traditional measurement of speed, it would probably be over 200 kph.
“Maybe the reason you aren’t getting enough exercise is because you always rely on your
power like this.”
“Fgn!?”
Mikoto’s unnecessary comment made Shirai’s mental state a bit unstable, but she
somehow managed to retain control over her power. They continued on and cut across
the ten-kilometer-diameter of the island in around three minutes.

- Toaru Kagaku no Railgun SS1, Chapter 7