1. Rhino outsped a train
The train I guess is comparable to the Metroliners, some extra-fare high speed trains between Washington, D.C. and New York City which operated from 1969 to 2006, which travels at up to 125 mph (201 km/h = 55.88 m s-1).
Rhino outpaces this train = Rhino's traveling speed is at least 55.88 m s-1, Subsonic (Faster than the Eye)
2. Rhino tags Spider-Man(?)
This may be an outlier, but still...
Somehow Rhino can tag with Spidey despite how clumsy he looks like. While it may be an outlier to say Rhino has MHS+ combat and reaction speeds, he may still have reacted to a Spider-Man who actually moves at Mach 1.88.
So IMO Rhino can still have a combat/reaction speed of Mach 1.88 (at least Supersonic (tags to Spider-Man moving at Mach 1.88), possibly Mach 7551 Massively Hypersonic+)
(Does Rhino have better things to scale to?)