Velocity is a vector: it has a direction. The others are all scalars.
The dimensions of the scalars are
Speed : [LT-1]
Time: [T]
Distance: [L]
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As speed=Distance/time, distance would be, distance = Speed x time or, s = vt where s is distance, v is speed or change in velocity and t is time
Distance alone is not enough to tell you velocity final. (If it could, then all of the thousands of runners who finish in the same marathon would all cross the finish line at the same speed.) Besides distance, you would also need velocity initial, and either acceleration or time.
Velocity, you divide distance/time Hi my names bob.
The slope (technically, the slope of the tangent at each point) of a distance-time graph gives the instantaneous velocity. Therefore, if the graph has a constant slope - i.e. it is a straight line - then that indicates a constant velocity (zero acceleration).
BecAuse that would mean it is going an infinite speed. The slope of a distance time graph is the objects velocity or speed. If there is a line parallel to the distance axis, there is a vertical line. The slope of a vertical line is infinite. It is not possible to go an infinite speed.