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People often say that the mathematics they learned in school and the mathematics that they use in their lives are very different and have little if anything to do with each other. The textbook or the teacher may have asked, for example, how long it takes to drive 20 miles at 40 miles per hour and accepted the answer of 30 minutes. But when you live 20 miles from the airport, the speed limit is 40 mph, and your cousin is due at 6 PM, does that mean you leave at 5:30? Your actual thinking may be quite different. This is rush hour. There are those intersections at which you don’t have the right of way. How long will it take to find a place to park? If you take the back way, the average drive may take longer, but there is much less variability in the total drive time. And you’d better find out when the plane is expected. But don’t forget that the arrival time they give you is the time the plane is expected to touch down on the runway, not when it will start discharging passengers at the gate. And so forth.
H. O. Pollak (Tue,) studied this question.