We're not completely sure what you mean by "per hour per second".
Going just by what we see in the question, it's an acceleration, not a velocity.
"Six miles per hour north" would be a velocity.
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20 miles per hour north is an example of
Speed = Distance divided by Time. So, speed = 75 miles divided by 2.5 hours = 75 / 2.5 = 30 miles per hour. Velocity is speed and direction, so the velocity is 30 mph Northbound.
3.00 m/s
Velocity = 790.514 m/s North (rounded)The idea is to divide the distance by the time.
Displacement: 8 m south Time: 4 seconds Therefore velocity = 2 metres per second Southwards.