There is a point where the smallest cut in front and slither polymer the most difficult. Therefore, in order to calculate the speed at which an area in front of the cutting point is a polymer which can be at any location.
A point is a point with minimal cross-sectional area and Polymer flow hardest. Therefore, in order to calculate the speed at which the cross-sectional area A Polymer can be built anywhere.
A point is the point of having minimal cross sectional area and polymer flow in the most difficult. So in the calculation of the fast ground point of a polymer can be in every area.