You divide 400m by 20s to get: 400 m / 20 s = 20 m/s (which is a moderate speed for a vehicle)
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It works out at 50.8 seconds for 400 metres.
If a square has a perimeter of 80 meters, then each side is 20 meters in length. (80/4 sides of a square=20) The area of a square is side2, so 20*20 equals 400. The area of a square that has a perimeter of 80 meters is 400 meters2.
In a square, if perimeter=80 meters, then side=20 meters, and area= 400 square meters.
(1,000 meters/20 minutes) x (1 minute/60 seconds) = 5/6 meter per second
20 meters per second