If it's the average speed of [a,b] where a is less than b, both are on the x axis (time), and both are in the domain of x then the equation is
(f(b)-f(a))/(b-a)
where f(b) is the distance when time=b and f(a) is the distance when time=a
(?)
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If you graph distance vs. time, the slope of the line will be the average speed.
To find the average speed or rate of something.(:
Speed is found by dividing the distance by the time. S=D/T You can use this equation for any point on the graph.
Assuming it's a graph of speed vs time, then between 2 times, the average is the distance (= area under the graph between those times) divided by the time difference.
speed is the gradient under the distance vs time graph which is change in distance /change in time