RAPID? BLITZ? BULLET?

A request for CHESS.COM: place A LARGE SIGN on your main page, the initial page, when we log in, clearly stating what these categories mean, PLEASE! I've been playing here for years, most times the same time (2-1 or 3 min). But when I want to try another one (5 min or 10 min, for instance), I never know my rating or my opponents' rating at this or that time. A VERY VERY VERY USEFUL NOTICE WOULD BE MORE OR LESS LIKE THIS:

BLITZ 1min, 2-1 and 3min

BULLET 5min and 10 min

RAPID any playing time greater than 10 min

etc. (I don't know if these times are the right ones, because it's ALWAYS EXTREMELY DIFFICULT to find this HIDDEN INFORMATION on chess.com pages. Thank you!

https://support.chess.com/customer/portal/articles/1444851

You got your blitz and bullet mixed up...bullet is quickest

can you en passant a pawn if a pawn is behind it? (like in the chess game below)

all the way. 

How it possible to reach this position?

this position is not possible.  first, the pawns could only be doubled if one of them took something, and black still has all pieces on the board.  second, the b pawn cannot move b2-b4 if there is already a pawn on b3 - so en passant would not apply anyway