The speed of light is
not 300,000 km/sec
Its 299,792.458 km/sec
Thats almost 208 km/sec difference!
For comparison, the speed of sound is 0.340 km/sec
The SR-71 (Blackbird), fastest airplane evah:

When it was really meaning it, was said to go at about 3,530 km/h.
That was an "h" grasshopper so that's actually 0.9 km/sec
Contrary to popular belief that is not actually the fastest, airplane looking, thing though. The space shuttle goes 8,04 km/sec in order to stay in orbit. (and so does the space station)
That however isn't the fastest a human has ever got, that's the Apollo 10 which at some point (the crew capsule) went 11.08 km/sec
Which means that the fastest humans have ever got, can't even begin to cover the
error between the actual and popular notion of the speed of light, and that light itself is very, very, very, fast.