So it seems "strax" is a synonym for "snart". (Got the option in multiple choice.)
It shouldn't have been shown there, I'll try to fix that. But you're right, it's a synonym.
What is the difference between snabbt and snart
Snabbt means "rapidly" and snart means "soon".
Worst news Duolingo could give me now. Quick! I MUST reactivate the bank's alarm and hide underneath these gold lingots here!