keeping in mind that there are 60 minutes in 1 hour, thus 4 hours is 4*60 or 240 minutes, thus if we add 45 minutes to that, that'd be 285 minutes, therefore, 4 hours and 45 minutes is 285 minutes.
now, we know the car travels 266 miles in 285 minutes, how many miles does it do in 60 minutes?

that many.