Welp, you've forced my hands.
First, we have to calculate the size of Namek. The easiest method to use to do so, is simply clocking Krillin’s trips back and forth from Guru’s place.
At this point in the story Krillin was moving at top speed to get back to Gohan. His exact powerlevel at this point isn’t known, but it’s later stated that both he and Gohan were above 10,000.
Why is this important?
Because we already know that Goku with a base powerlevel of 8,000 could travel at Mach 29 when going full speed; so at the very least we can apply this to Krillin (who truth be told ought to be much faster, but for all intents an purposes, it's fair in this case to lowball the size).
Mach 29 is 9,952.8 m/s or 9.9528 km/s, and with there being 3,600 seconds in an hour this would at the very least mean that Krillin was traveling at somewhere around 35,830 kilometers per hour. We multiply that by 2 (he said it would take a couple of hours) and we get 71,660.
Now from what we’ve seen, Krillin had gone about halfway across the planet, meaning that Nameks circumference should be somewhere around 143,320.xx kilometers (71,660 x2), or 3.5 times larger than the Earths. Making the Diameter somewhere around 45,620 kilometers, or again, 3.5 times larger than the Earth.
I’m paraphrasing information I remember seeing in a blog over at the OBD or somewhere, the numbers are solid, and it’s generally the best guess we’ve got as to the size of Namek.
Nameks circumference on a reliable scale is 70,131.25 km, at that point.
Now, we can calculate the actual speed gauged IN the series. Master Roshi and Krillin traded a series of blows as well as counters, strategy and movement all in one-fifth of a second in Dragon Ball, both with power levels of 80 to 100 according to logic and the Daizenshuu. I was low-balling, by taking the power level of 100, and inputting it into Frieza's power level, the one he used when stomping Vegeta, not his full power of 120 million, but his 0.5% full power of 6 million. However, it's not possible to know how many punches or kicks they threw, so you have to be fair and low-ball the number, so you then are left with making Frieza's hand slower than it actually is, because Roshi and Krillin were moving and doing many things in the fifth of a second. Goku flew across half the distance of Namek, which has been calculated to be 3.5 times bigger than Earth, in less time than it took for Frieza's hand to travel to Vegeta.
So, using the fifth of a second, we can divide it by the difference in 6 million and 100, giving us 60,000 which we divide a fifth by. That gives us the time it would have taken for Frieza's fist to reach Vegeta, which is low-balled to 0.000003, or one 3 millionths of a second. So, we can safely say that Goku flew across half Nameks distance in a 3 millionth of a second. So, with some simple multiplication and division, he flew 70,131.25 km in less than one 3 millionth of a second. Now, to get his simple speed in km/sec, we just multiply both sides by 300,000 to get 21,039,375,000 km/sec. Light is only 297,600 km/sec, making base Namek Goku 70,700 times faster than light.
Sooo... Yep, and Lolyes. 👆