The reason the question wasn't answered is because the question is not relevant to what he is wanting answered.[&:]
A bow can not and will not shoot flat to 40 yards regardless if it shoots 200 fps or 400 fps.
If a person wants to shoot flat at 40 yards then they need a rifle.

(even then there is a difference,but very slight)
The information needs to be given so that he can make an infomed decision on what he may want.