225 feet
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225 feet is a very vague and most importantly, incorrect answer.
If you know for sure you are throwing 55mph off of a mound, then during a long toss session if you throw a Baseball around a 45-50 degree angle you should be able to reach around 150 feet. 225 feet translates into about 73mph thrown at a 45 degree angle. This is also for the fact that the elevation at which you are is close to sea level and if there is little to no wind.
-R
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