To find how far Brian ran in 18 minutes, divide the distance he ran in 40 minutes by the time ratio: 5 kilometers / 40 minutes = 1 kilometer / 8 minutes
Then multiply the ratio by the number of minutes Brian ran: 1 kilometer/8 minutes * 18 minutes = 2.25 kilometers. Answer: \boxed{2.25}.
Brian ran a 5-kilometer race in 40 minutes. How far did he run in 18 minutes? Write your answer as a decimal, and do not round.
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