There are two possible answers to this question.
The simpler one:
Journey time varies inversely with velocity. The time taken for a journey is equal to the distance divided by the velocity. Double the velocity and you halve the [journey] time, etc.
The more complicated one:
Relativity requires time to go more slowly as velocity increases. Although this applies at all velocities it is noticeable only when you are travelling close to the speed of light.
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Distance is dependent on time. If there is no time, there is no distance, as distance = velocity * time. As time or speed increases so will distance, therefore, if distance increases, either speed or time must increase. If either speed or time = 0, then distance will equal 0.
The graph of velocity-time is the acceleration.
Change in velocity divided by time is acceleration, but velocity divided by time has no particular significance.
A velocity time graph is still a velocity time graph - no matter the degree of detail that you look at it.
velocity = distance/time