Sanja can run 4 miles in 28 minutes. arien can run 8 miles in 72 minutes. if both of them run a mile, who will finish first and how much faster?

Sanja. multiply 28x2 and subtract that from 72 good luck

We have to calculate how much can they run in one minute.
Sanja:
4 miles28 minutes
x  1 minute

x=(4 miles * 1 minute) / 28 minutes=1/7 miles

Arien:
8 miles72 minutes
x  1 minutes

x=(8 miles * 1 minute) / 72 minutes=1/9 miles.

so; 1/7 miles >1/9 miles

Therefore: Sanja will finish first.