Maybe it's just me, because I played when I was younger, but the translation is obviously supposed to be kph, not mph. The fast pitch recorded in an MLB game is just over 105mph. There are some unofficial ones faster, but certainly not 140mph.
http://www.mangago.zone/read-manga/chuchun_ga_chun/mf/v01/c003/5/
Is this from a real manga? http://www.mangago.zone/read-manga/yume_musubi_koi_musubi/mf/v02/c007/3/
I keep seeing it and am curious.
http://www.mangago.zone/read-manga/yume_musubi_koi_musubi/mf/v02/c007/2/
I meant this one.