Assuming t is time, you need to know the distance traveled in time t. Then, divide the distance by time to obtain speed (velocity).
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That depends upon what the object has done for the 20 seconds since t = 0 seconds.
Speed = 10/7 m/s
On a speed time graph, the distance can be calculated by working out the area underneath the line. To work out the distance travelled between t=0 and t=10 you would need to find these two values and then work out the area on the graph of the shape bound by the line of the particle, the x axis, t=0 and t=10. The average speed of the particle is the distance (calculated above) divided by 10.
Speed equals distance divided by time. S=D/T.
By using the formula distance equals rate times time or d = r x t