speed is the gradient under the distance vs time graph which is change in distance /change in time
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If you graph distance vs. time, the slope of the line will be the average speed.
You can calculate speed by taking the gradient (dy/dx) from a Distance-time graph since s=d/t
On a distance-time graph, the gradient of the line is numerically equal to the speed. therefore if you get the rise over the run you should be able to calculate the speed traveled at.
The slope of a distance-time graph represents speed.
The speed is the slope of the curve in such a graph.