how tall

Once, an engineer, a physicist and a safety officer all applied for the
same job. The person interviewed all three, and thought all were
excellent. He had to think of some way to find the best person. So he
told them all to come back the next day and tell him the exact height
of the building. The one who was closest would get the job.
The physicist went to the top of the building, and dropped iron
balls to the ground, and had his friend time the balls. He did
this several times.
The engineer got out a sextant, and computed ratios of a yardstick to
the building, etc.
The next day, the manager asks all three of them to tell how tall the
building is.
"75 feet, 2.8 inches" says the physicist.
"76 feet, 4.1 inches" says the engineer.
"75 feet, 8.4 inches" says the safety officer.
"My God!" said the manager, "the safety officer got it exactly correct!
How did you manage that?"
"Well", said the safety officer, "I went down to the planning
department and looked up the height in the building records."