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

Answer 1

To find out how far Brian ran in 18 minutes, we first need to determine his speed.

1. Calculate his speed:

   Brian ran 5 kilometers in 40 minutes.

   \[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} = \frac{5 \text{ km}}{40 \text{ min}} = \frac{5}{40} \text{ km/min} = \frac{1}{8} \text{ km/min} \]

2. Calculate the distance he ran in 18 minutes:

   Now, we can use his speed to find out how far he ran in 18 minutes.

   \[ \text{Distance} = \text{Speed} \times \text{Time} = \left(\frac{1}{8} \text{ km/min}\right) \times 18 \text{ min} \]

   \[ \text{Distance} = \frac{18}{8} \text{ km} = \frac{9}{4} \text{ km} = 2.25 \text{ km} \]

Thus, the distance Brian ran in 18 minutes is \( \boxed{2.25} \) kilometers.