Let x = the unknown amount of time it takes to run 10 miles. We are going to use this to set up a proportion and then crossmultiply.
[tex] \frac{3 miles}{27 min} = \frac{10 miles}{x min} [/tex]
Now we cross-multiply
3x = 27(10)
3x = 270
x = 90
It will take Jack 90 minutes to run 10 miles.
Apologies for the delayed answer. I'm surprised no one saw this before.
