A person drove 30 miles per hour on a trip. If he had driven 40 miles per hour, he would have arrived 4 hours earlier. What was the distance the person drove?
30 miles/hour * x hours= 40 miles/hour * (x-4) hours Distribute the 40, so you get 30x=40x-160 Subtract 40x from both sides -10x=-160 Divide both sides by -10 x=16 They drove 16 miles
