Dan runs
3
miles in
28
minutes. at the same rate, how many miles would he run in
42
minutes?

So you need to find out how much time it takes him to run 1 mile. You do this by dividing 28 by 3. Once you know it equals, which is 9.3333, so about 9:21 minutes, now you can divide 42 by 9.3333 (because that is what it equaled) and you get 4.5 miles.