Alright, so I will be trying to calc this feat today.
It seems that XRL8 moved from third base to somewhere in the outfield before the baseball could move even a little bit.
However, given that the gif above likely comes from 2 clips and that XLR8 was actually moving from the stands to the baseball field everytime he did this kind of stunt, this may be a lowball.
But let's do some scaling nonetheless.
Baseball Field
Baseball Field: Size of line to third base to barely into outfield: 635 pixels = 42.75 meters
Size of given 27.4m line: 407 pixels
Size of line from home base to barely into outfield: 597 pixels = 40.19 meters
For the ball's movement during this time period, seeing as it didn't really seem to shift at all, I will use the lowest possible measure for it: 1 pixel
Ben 10 catch
Ben 10 catch:
Outfielder height = average height of US white male at 17 (176cm) = 225 pixels
Baseball movement = 1 pixel = 0.007822 meters
Now for the min and max speeds:
Pitched high school baseballs travel at least in the 70 mph range from a decent team. According to this page, the bat actually tends to add more speed to this baseball, but just marginally. We will be using the lowest mph figure on the exit speed of a bat for a high school player for the high end (which is 53 mph).
However, we also know that baseballs can speed up as they fall. According to this page and the estimates of the distance from home base we got earlier (~132 feet), the baseball must have been going at least 40 mph. However, considering that this page also treats baseballs as having zero speed upon leaving the bat (which is wrong), we will consider this an absolute low end.
Plugging in for timeframe:
Max: 0.007822m/22.353m/s = 3.499 x 10^-4 seconds
Min: 0.007822m/17.8816m/s = 4.374 x 10^-4 seconds
And then speed:
High-end: 42.75m/3.499x10^-4s = 122,167 m/s = Mach 356
Low-end: 42.75m/4.373x10^-4s = 97,729m/s = Mach 285
Massively Hypersonic