You ever go to a party and there was that one guy who was just so ignorant and awkward he killed conversations by opening his mouth? You just met that guy.
Some teammates and I did some indoor hitting last winter for the first time, the place we went to loaned out radar guns. All balls were .52/275 Worth Hot Dots in varying condition. No big hitters involved, just a bunch of rec league guys. Typical exit speeds were low to mid 80's, some guys struggled to hit 80. Me and our 21yo muscly-armed paperboy had a battle for highest speed; we both got into the 90's. He hit a few at 92 and got 94 once, I hit 91 with 3 different composite bats, then I got 93 with a singlewall TPS Powerdome of all things. Fastest exit speeds were from one-hoppers and hard, low liners right back up the middle. Balls that felt crushed and had HR trajectory were way lower, usually around 80-85. For reference, the young gun and myself regularly hit HR's in the 300'-320' range but rarely hit anything farther. We might each get ahold of 1-2 balls/season that get over 330'. For someone to hit a ball 375+, you're probably looking at exit speed in the 100's combined with near ideal trajectory and spin.