Question

Rodulpho takes 12 mins to run 6 times around a 400-meter track. Assuming he runs at a constant speed , how long does he take to run 1 kilometer?

Answer 1

First you have to find out how far he ran in 12 minutes
$6 \times 400 = 2400 meters$
Now we can set up a proportion to find out how long it took him to run 1000 meters or 1 kilometer
$\frac{12}{2400} = \frac{x}{1000}$
We can solve to figure out that x = 5 so it took him 5 minutes to run 1 kilometer