City b is northwest of city a, and the 400 mile trip by car takes 8 hours. the cities are 320 miles apart if able to travel in a straight line. what is the speed of a trip from city a to city b?

Ablue car pulls away from a red stop-light just after it has turned green with a constant acceleration of 0.5 m/s 2 . a green car arrives at the position of the stop-light 6.5 s after the light had turned green. if t = 0 when the light turns green, at what time does the green car catch the blue car if the green car maintains the slowest constant speed necessary to catch up to the blue car? answer in units of s.