please also determine the stagnation point

Q4. (15 marks) The velocity field of a flow is given by V = (5z - 3)i + (x + 4)j + 4yk ft/s, where x,y and z are in feet. Determine the fluid speed at the origin (x = y=z= 0) and on the x-axis (y=z= 0). Also determine the stagnation point for this flow