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
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To compare this, you must convert to a common unit. For example, converting everything to meters, 3 km = 3000 meters. This is less than 4000 meters.
To convert from km to meters, simply multiply by 1000.
Convert everything to meters (1 kilometer = 1000 meters); then you can easily compare the measurements.
ill first convert them all to meters 2 meters = 2m 100 centimeters = 1m 4 decimeters = .4m 3 kilometers = 3000m therefore... 4 decimeters, 100 centimeters, 2 meters, 3 kilometers.
3 kilometers is equal to 3,000 meters.