0.4 km
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You cannot convert 400 meters to 3 kilometers. They are two different lengths. 1 kilometer = 1,000 meters. 3 kilometers would be 3,000 meters. 400 meters would be 0.4 kilometers
In order to convert meters to kilometers you would go meters divided by 1000 = kilometers. So your answer is 0.0057104.
a) Divide the kilometers by the hours, to get the speed in kilometers per hour. b) Divide this result by 3.6, to convert to meters/second.
553.33 meters = 0.5533 kilometers
0.42 kilometers = 420 meters. (A kilometer is 1000 meters.)