300 kilometers = 186.4 miles so basically its a long swim
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1,000 meter = 1 kilometer 300 meter = 0.3 kilometer
1,000 meters = 1 kilometer 300 meters = 0.3 kilometer (3/10)
A distance of 300 meters is 30% of a kilometer.
we know,speed =distance /time time =300 /20 =15 hr
a train can be a kilometer long. A bridge or road could also be. This question is just too vague.