Netero who is way lower is speed of sound with body movement.
Above that with hand movement.
And his hatsu is even above that.
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Here is a note worthy calc for it.
This scan states that Netero has hit Meruem hundreds of thousands of times since they got into the tomb…
Ok, so this one is tricky, but bare with me. Youpi and Pouf leave to go find the king well after he and Netero have started fighting:
The above scan is right before a reaction shot of Meruem in a crater from Netero’s first attack.
Youpi claims that it would take 15 minutes to get from the battleground back to the palace. This is after he realizes that Meruem has gained his flight ability. Therefore, it would not be much of a stretch to say that it took Pouf and Youpi around 15 minutes to take their trip to reach their king.
However, we see here that after the statement of “Hundreds of thousands of blows”, another minute is spent battling between the two and Youpi and Pouf have not yet arrived. In fact, but the time of the rose nuke going off, they
still haven’t reached the battleground.
So we’re down to 14 minutes instead of 15. But I think there’s potentially more to that than one might think. We can use the “mushroom cloud”, in this case, the rose shape, as a reference of time too. You see, mushroom clouds tend to reach their full size in
10 minutes.
So now we’re down to a time frame of
4 minutes, or 240 s.
Yep, we’re back to this one. As a reminder, Meruem is
1.942 m.
137 / 12 = 11.417 * 1.942 =
22.172 m, length of arm.
Seeing as the scan says “Hundreds of thousands”, I can’t imagine this being less than 200,000 strikes, otherwise if it were less, it would have been “Over a hundred thousand” instead.
Now here I assume that one arm extends fully on average to make a hit. I am not including the distance to draw the arm back, because Hyakushiki Kannon has the many arms that can work independently of one another. In other words, it could be making a strike at the exact same time as pulling an arm back, therefore losing no time at all.
22.172 * 200,000 =
4,434,400 m, total distance traveled by puppet arm.
4,434,400 / 240 =
18,476.667 m/s, or Mach 54.34
Just for fun, what about the highest end possible? 999,999 strikes?
22.172 * 999,999 =
22,171,977.828 m, total distance traveled by puppet arm.
22,171,977.828 /240 =
92,383.241 m/s, or Mach 271.72
Source:
https://cablescalculations.wordpress.com/category/hunterxhunter-calculations/
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By keeping up with that speed Pre Rose Mereum is:
Low Ball - 54.34
High Ball - Mach 271.72
And Post Rose Mereum several times faster than Pre Rose.