5 mph
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Because it is so heavy. and they want it to go quick. Correction. The Roman racing chariots were extremely light and small, with bands of leather used for the flooring to reduce weight. Four horses made for a more exciting race, although there were also races with chariots pulled by two horses. The emperor Nero was said to have driven a chariot with ten horses.
The maximum speed a submarine can reach on the surface is around 20-25 knots, which is equivalent to 23-29 miles per hour.
It will increase the speed at which you can jump rope. It won't effect the maximum speed of your mini-van however.
Belmont Racetrack is a mile and a half long; the horses race a complete circuit around it to make the Belmont Stakes the longest race in the Triple Crown.
avg speed=total distance/total time avg speed=60/20=3mtr/sec