Question

a body is moving with a velocity of 25 metre per second if the motion is uniform its velocity of the 10 seconds

Answer 1

First of all there is a little error in your question I suppose : 

A body is moving with a velocity of 25 metre per second if the motion is uniform its velocity of the 10 seconds
I think it will be after
So the answer is : 
25 m/s. This is because since we know that the motion is constant so the velocity is also constant and hence the answer is 25 m/s.