To find out how far Brian ran in 18 minutes, we can first determine his speed in kilometers per minute. Brian ran 5 kilometers in 40 minutes.
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Calculate his speed: \[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} = \frac{5 \text{ km}}{40 \text{ min}} = 0.125 \text{ km/min} \]
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Now, we can use his speed to find out how far he ran in 18 minutes: \[ \text{Distance in 18 minutes} = \text{Speed} \times \text{Time} = 0.125 \text{ km/min} \times 18 \text{ min} = 2.25 \text{ km} \]
Therefore, Brian ran 2.25 kilometers in 18 minutes.