Brian ran a 5- kilometer race in 40 minutes. How far did he run in 18 minutes? Write answer in decimal form

Answer 1

To find how far Brian ran in 18 minutes, we need to set up a proportion.

The ratio of the distance Brian ran to the time it took him to run that distance is constant. We can write this relationship as:

Distance / Time = Constant

Let's call the distance Brian ran in 18 minutes "x". We can set up the proportion as follows:

5 km / 40 min = x / 18 min

Now we can solve for x by cross-multiplying:

40 min * x = 5 km * 18 min

40x = 90 km*min

To isolate x, we divide both sides of the equation by 40:

x = 90 km*min / 40

Simplifying, we find:

x = 2.25 km

Therefore, Brian ran 2.25 kilometers in 18 minutes.