Most of the times the title is written by someone else. My guess is that they go to something like https://www.wolframalpha.com/input?i=2.43+km+a+second https:/

Most of the times the title is written by someone else. My guess is that they go to something like https://www.wolframalpha.com/input?i=2.43+km+a+second https://www.wolframalpha.com/input?i=2.43+km+a+second [1] and copy the most clickbaity version. [1] I didn't get 7x speed of sound, but you may be more lucky.