The volume of water flowing through a pipe varies directly wlth the square of the radius of the pipe. if the water flows at a rate of 80 liters per minute through a pipe with a radlus of 4 cm, at what rate would water flow through a pipe with a radius of 3 cm? (rigorous) (competency 007) 11. a) 45 liters per minute b) 6.67 liters per minute c) 60 liters per minute d) 4.5 liters per minute