how fast was the saturn v
The masses and Isp of each stage can be looked up on wikipedia. That means a Saturn V started in space could reach a speed of about 18 km per second or 64,500 km/h relative to its initial frame of reference. The speed of light is about 300,000 km per second, so this is still just about 0.006% of the speed of light. This speed is just the rocket without any payload.