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11.71
4 metres per second.
Since there are 3600 seconds in one hour, 12 seconds is 1/300 hour.To travel 18 meters in 12 seconds is the same average speed as traveling 5400 (300 x 18) meters in 1 hour, or 54 km per hour.
12 meters per second
Distance = Rate * Timeso,Rate(speed) = Distance/Time= 112 meters/4 seconds= 28 meters/second