So... I dont feel like doing the math, but reading how some people are doing it... you're doing speed into hours. That give km/h. That km/h is then split between all active players on in that hour.
No, the # of hours played is all players combined, not the # of hours the game has been active. The only reason you would split the km/h between all active players is if the # of hours played was divided by the # of players playing the game which would give you the average # of hours played *per player*. Unless you think the average player has been playing DayZ for 2,500 years, then no, you don't divide the km/h by the # of active players. Even if you did, you'd be dividing 145km/hr by over a million, which would result in an even more ridiculous speed...just on the other end of the ridiculous spectrum lol.