ASVAB Armed Services Vocational Aptitude Battery (#102)

Section: Arithmetic Reasoning

A man makes a 255-mile trip by car. He drives the first 2 hours at 45 miles per hour. At what speed must he then travel for the remainder of the trip in order to arrive at his destination 5 hours after he started?

31 miles per hour
50 miles per hour
51 miles per hour
55miles per hour