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exists and is an alternate of . It depends on the stroke and the distance, but using the fastest stroke over the shortest distance (freestyle over 100m), Phelps' record is 47.51 seconds. This equates to around 4.7 mph - brisk walking pace.
Exit speed is generally faster than bat speed. A 20% variance would be a very rough rule of thumb. The formula is exit speed=q*(pitch speed) + (1+q)*(bat speed) where q is roughly 0.2 for a wood bat. Average MLB fastball speed is 91 mph out of the hand, and 83 mph at the plate. Example: MLB average exit speed is 103 mph, bat speed ranges roughly from 70-85 mph. Wood bats generate a lower exit speed than a non-wood bat.