Average acceleration = Change in speed/time
so
Time = Change in speed/Average acceleration
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The answer depends on what you want to do: calculate acceleration, journey time?
Acceleration is the time rate of change of speed. Acceleration = speed/time.
If you know the initial speed (u), acceleration (a) and time (t), then the final speed, v = u + at.
Calculate the gradient of the curve which will give the acceleration. Change the sign of the answer to convert acceleration into retardation.
This is imposible to calculate. In order to find acceleration, knowlege of at least 3 of these variables must be given: initial speed, final speed, distance, and time.