Solve Velocity Problem: Find Car's Velocity in ft/sec

[atelaphobia]

For some reason i don't know why i can't get this problem:

A stunt driver travels a total distance of 1172 ft moving at a constant speed of 40 mph while weaving through an obstacl ecourse. If the total displacement of the car is 600 ft from the start of the course to the finish, determine the car's velocity

ANSWER: velocity = 30 feet/sec

but how did they get that?

 

[StatusX]

Velocity is displacement over time. You have the displacement, so find the time. And next time, you should probably post a question like this in intro physics.