How would you describe the pace at which you work?

If you know your niche well then you can precisely calculate whether you are fast enough at getting things done or not. Scale it from 1 to 10. 7/10 or 8/10 is a satisfactory reply. You can also evade this question cleverly by saying something like:

Sir, I have never counted that. What I really counted is, there is not a single instance in my professional career where I haven't delivered the project within its time limit.