Question

Please help!

Answer 1

¡Hola!

A veces en el aeropuerto los pasajeros no prestan atención y se chocan con otros pasajeros.

CHOCARSE

me choco

te chocas

se choca

nos chocamos

os chocáis

se chocan  ==>  los pasajeros se chocan

☺☺☺

Answer 2

Se chocan

We use “se” because you are referring to a group of passengers. Se is used for “they” when the group is plural or singular third person.
We use “chocan” because they are bumping into other passengers which is plural. Chocan is for plural.