TASK DEFINITION: This task is about translating a given French language sentence to English.
PROBLEM: (plus de rire)

SOLUTION: [More laughter]

PROBLEM: "Hmm ?"

SOLUTION: Hmm?

PROBLEM: En derivant cette formule selon t, bien sur.

SOLUTION:
It's just the time derivative of this, right? Just the time derivative of the distance is the velocity.