Question

Tonya runs 8 kilometers in 60 minutes. at this rate, how long would it take her to run 2 kilometers?

Answer 1

Here they have told you the extended amount of time and what that would give you. 8 kilometers=60 minutes, yes?
This is a ratio, meaning that you can have mulitiple numbers that mean the same thing.
You would, instead of multiplying like you would for a number larger than you're looking for, would simply divide both sides by the same number so that they'll stay even and balanced, the values unchanged.
So 8 and 60 have a same multiple, 4.
Divide four on both sides to get 2 and 15.
2 would be the number of kilometers you are looking for and 15 would be the number of minutes that Tonya would need to run.

Answer 2

we know that

Tonya runs
`8` kilometers in
`60` minutes

so

by proportion

Find the time take Tonya to run
`2` kilometers

`(60)/(8)(minutes)/(km)=(x)/(2)(minutes)/(km) \\ \\x*8=60*2\\ \\x=60*2/8\\ \\x=15\ minutes`

therefore

the answer is

`15\ minutes`