The answer depends on what information, if any, you have.
If your question is in the context of space walks near earth-orbiting stations, you could have gyroscopes that measures your movement. Distance is easily measured, especially with laser range-finders, Change in distance is velocity and so on.
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Speed = distance divided by time
Speed = Distance divided by Time
You can calculate a speed by dividing a distance by the time it takes to cover that distance. If you want the instantaneous speed (for situations of variable speed), you need to calculate the distance and time for a fairly short time interval (ideally, the limit, when the time approaches zero).
Average speed = (distance covered) divided by (time to cover the distance)
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