https://www.wolframalpha.com/input/?i=%28about+12.4+miles+per+second%29+%2F+21
(about 12.4 miles per second) / 21 - Wolfram|Alpha
miles per second12 421wolframalpha
https://www.popsci.com/science/supermassive-black-hole-winds/
Supermassive black hole belches 30,000-miles-per-second winds | Popular Science
Two X-ray space telescopes captured the never-before-seen blast 130 million light-years away.
supermassive black hole30 000