the final speed of a car in a quarter mile is 80 mph. the average velocity is?

Answer 1

If you assume the car started at rest and accelerated uniformly (which most of these problems would state.)
Then, distance traveled (D) is equal to 1/2 a t squared.
Since V= at, then :
1/4 miles = 1/2 80 miles per hour times t
solve for t
t = 1/160 hours
1/4 miles / (1/160 hours) = 40 miles per hour

Answer 2

Need to know how long it took to get there.