A good athlete can run 1.5 km in about 3 min 50 pec the 1958 world record was 3 min 36.8 sec. Any ordinary person usually does, when walking, about 1.5 metres a second. Reducing the athlete's rate to a common denominator, we see that he covers seven metres every second. These speeds are not absolutely comparable though. Walking, you can keep on for hours on end at the rate of 5 km. p.h. But the runner will keep up his speed for only a short while. On quick march, infantry move at a speed which is but a third of the athlete's, doing 2 m/sec, or 7 odd km. p.h. But they can cover a much greater distance.
I daresay you would find it of interest to compare your normal walking pace with the "speed" of the proverbially slow snail or tortoise. The snail well lives up to its reputation, doing 1.5 mm/sec, or 5.4 metres p.h. exactly one thousand times less than your rate. The other classically slow animal, the tortoise, is not very much faster, doing usually
70 meters p.h.
Nimble compared to the snail and the tortoise, you would find yourself greatly outraced when comparing your own motion with other motions even not very fast ones that we see all around us. True, you will easily outpace the current of most rivers in the plains and be a pretty good second to a moderate wind. But you will successfully vie with a fly, which does 5 m/sec, only if you don skis. You won't overtake a hare or a hunting dog even when riding a fast horse and you can rival the eagle only aboard a plane.
Still the machines man has invented make him second to none for speed. Some time ago a passenger hydrofoil ship, capable of 60-70 km. p.h., was launched in the U.S.S.R. On land you can move faster than on water by riding trains or motor cars which can do up to
200 km. p.h. and more. Modern aircraft greatly exceed even these speeds. Many Soviet air routes are serviced by the large TU-104 and TU-114 jet liners, which do about 800 km. p.h. It was not so long ago that aircraft designers sought to overcome the "sound barrier", to attain speeds faster than that of sound, which is 330 m/sec, or 1,200 km. p.b. Today this has been achieved. We have some small but very fast supersonic jet aircraft that can do as much as 2,000 km.p.h.
There are man-made vehicles that can work up still greater speeds. The initial launching speed of the first Soviet sputnik was about 8 km/sec. Later Soviet space rockets exceeded the so-called velocity, which is 11.2 km/sec at ground level.
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