4 hours 16 minutes @75 mph
5 hours 49 minutes.
1 hour improved answer: LOL..if u drive approximately 300 miles per hour, that is. it's approximately 320 miles from the Pittsburgh airport to philly, so....
320 miles
Matts speed was 320/5 miles per hour. At 320/5 mph he could have driven 9*320/5 miles = 9*64 = 576 miles.
320 km per hour equals 198.83 miles per hour.
4.57 hours
320/60 = 51/3 hours = 5hours 20minutes
4 hours 55 minutes.
4 hours 16 minutes.
6 hours, 24 minutes
4 hours
320 km/h = about 198.84 mph