Final answer:
To sober up an intoxicated person, their body needs time to metabolize the alcohol; no other methods like coffee or exercise will expedite this process. It takes at least five hours for a person with a BAC of 0.08 to sober up.
Step-by-step explanation:
The only way to sober up a person who is intoxicated is to give their body time to process the alcohol. This is because alcohol metabolism involves the liver breaking down the ingested alcohol, and no other methods, such as drinking coffee or exercising, can speed up this process. Considering the alcohol excretion rate, a legally intoxicated person with a Blood Alcohol Concentration (BAC) of 0.08 will require at least five hours to achieve sobriety after they stop drinking.