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