What do the lowercase letters V and T mean in mathematics?

V stands for speed and t stands for time.

The question should be

S=VT=(-20)*4=-80

That is to say, 80 kilometers west, 4, V stands for speed T stands for time, and the actual direction is 80 kilometers west, 2. What do the lowercase letters V and T mean in mathematics?

By the way, a kind person can help me understand that the car is driving on a straight and wide road, and the east side is positive. If V =-20 km/h and T = 4 h, what is the distance in the actual driving direction of the car?

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