"Yes." And leave it at that. he'll move on to the next line of questioning. Acceptance of the speed you were going, along with a confirmation that you were not

"Yes." And leave it at that. he'll move on to the next line of questioning. Acceptance of the speed you were going, along with a confirmation that you were not being inattentive while driving (which is the point of the question) will solve your issues much faster. I have gotten out of speeding tickets by simply stating "Yes". "Not fast enough; you still caught me" is definitely not the best answer, but a funny one.