"We go in, and you go away?"

Translation: Bemegyünk, ti pedig elmentek?

[Suzep7]

You can be te or ti - but only ti is accepted :(

[Suzep7]

mentek el? I though in questions those two parts should be separated?

[RyagonIV]

Hocus focus.
Whether you separate the prefix from the verb has nothing to do with it being a question, but rather what you want to focus on. If you have a question word (!) like ki or a phrase like hány nő, they want to be in the focus, of course, since that's what you want to have answered. But in yes-or-no questions like this one, the focus is on the verb, à la "Do you do this or do you not do this?" Thus, the prefix should remain attached.

[ZsodaMester]

In Hungarian you wouldn't say Mi bemegyünk, it would be Mi megyünk be,

[Martybet]

Where is the 'and'?

[RyagonIV]

The preferred translation is "Bemegyünk, ti pedig elmentek?"