According to this Silverback gorillas are ten times stronger than a average human
https://www.natgeokids.com/uk/discover/animals/general-animals/gorilla-facts/
Oh yeah I forgot he also used the nimbus to get to Nappa and Vegeta and he was definitely relavistic, if not ftl at that point. Though one could make the argument that Goku's travel speed is nowhere near as good as his combat speed.
He did take an awfully long time getting through snake way...
Yeah Ranfan is really underrated. She only looks weak because she was paired against someone nearly Tailed Goku level. If that bully got hit by the punch that damaged fucking Nam he would been out like a light.
He has to be atleast rivaling 1st Form Freeza for him to think he can beat an estimated transformed Freeza with Gohan and Kuririn's help, who are both considerably weaker unless he was expecting Gohan to get a big rage Amp or something.