Take a look at this question.
It was answered 10 minutes after being asked, and accepted right after that (a rather quick timing for this site, I believe). To me, speaks about premeditate coordination. Both users were created today, and they are both relatively similar, as both seem to speak Spanish, given their names and the nationality one declares. They could even be the same person.
My question is: is this something to be suspicious of? In particular, that the two users might ask questions and provide answers to each other, in order to increase their reputation.