Yes.
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If you graph distance vs. time, the slope of the line will be the average speed.
You can use a graph to calculate speed.
Its initial speed cannot be 20 m, as stated in the question. Secondly, if the initial speed is correctly given, then there is no need to calculate it!
You can calculate speed by taking the gradient (dy/dx) from a Distance-time graph since s=d/t
speed is the gradient under the distance vs time graph which is change in distance /change in time