This task is about translating a given English language sentence to French.

And let's just think about what this is saying, and then we can get it all into seconds, or hours, whatever you like. This is saying that every second, this Porsche 911 can increase its velocity by 20 mph. So its acceleration is 20 miles per hour per second.
Et vous pouvez dire de 0 mph vers l'Est à 60 mph vers l'Est en 3 secondes, quel était l'accélération ici ?