I am a 24 year old male, at 130 lbs.
As the question states:
In a 2 hour drinking period, how long would it take for the BAC to be completely zero?

Predicting BAC and elimination isn't nearly that precise. Your BAC could range from .07 to .10 at the end of 2 hours. Your elimination rate could vary from .011 to .02 ph. So the range of elimination could be from 3.5 - 9 hours.

Is this an academic question or are you trying to figure out when/how to pass a test?