I don't think "paralactic second" is a valid unit. The arc-second used for expressing a parallax is 1/3600 of a degree. This is an angular unit, not a unit of length, and can therefore not be readily converted to meters.
There are 1000 meters/second in 1 kilo meters/second
1 foot per second = 0.3048 meters per second.
447.04 Meters/Second
23.6 meters per second.
750mph equates to 335.28 meters per second.
23.08 meters per minute = 0.38467 meters per second (rounded)
340.29 meters per second at sea level.
17 meters per second is about 38.03 mph
55 mph = 24.59 meters per second.
134.112 meters per second.
1.6256 meters per second
24.6 meters per second.