Two cylindrical pipes both carry an ideal fluid (zero viscosity) in laminar flow. Pipe A has a radius RA = 8 cm and a flow velocity VA = 2 cm/s. Pipe B has a radius RB = 4 cm and a flow velocity VB = 4 cm/s. Compared to the rate of flow in pipe A, that in pipe B is:
A. The same
B. Half as large
C. Twice as large
D. It depends on the length of the pipe
*hint: it's not twice as large*