Respuesta :

Here, Speed = Distance / Time
We have; d = 10 m
t = 20 s

Substitute their values, 
s = 10 / 20 
s = 1/2 
s = 0.5 m/s

In short, Your Answer would be 0.5 m/s

Hope this helps!
AL2006
You use the formula

                 Speed  =  (distance covered)
                                           divided by
                            (time to cover the distance)  .

After posting so many speed/distance/time problems and getting the answers
with the full solutions, you should be be able to do these on your own by now.