Se hicieron amigos rápidamente

[ROBINDESBOIS]

They made friends with quickly
the became good friends quickly.

Are they correct?

[pjt33]

They made friends with quickly :good:
they became good friends quickly. :?:
Second one works better with reordering:

They quickly became good friends. :good:

[Rusty]

I agree with pjt33. However, if you'd like to use 'with' in the sentence, these work:

They made friends with each other quickly.
They quickly made friends with each other.