Question

city b is north of city a and the 400 mile trip by care takes 8 the cities are 320 miles apart in a straight line what is the velocity of a trip from city a to city b
I assume you mean 8 hours.

Velocity is the displacement /time and direction
Here that is 320/8 or 40 mph North

The 400 zigging and zagging is irrelevant for velocity but important if you wanted speed instead of velocity

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