Okay, so I am assuming you are given the knowledge that you can drive 169 miles in 3 hours and 30 minutes. To start, transfer the hours to minutes.
3 * 60 = 180
Add the extra 30 minutes.
180 + 30 = 210
So you drove 169 miles in 210 minutes. Divide the miles by the time spent.
169/210 = .8.
You can drive .8 miles a minute.
