UPS Package Handler interview questions

Signed up and got the job. Have to pass a drug and background test. They're constantly looking for bodies, with generally high attrition rate for new hires. The guys that get through the probationary period typically stay a long time, many until retirement.

Straight forward, to the point. Question and answer style. Can you manage to move X amount of packages in Y amount of hours? How well do you deal with difficult personalities?