An extrusion operation produces continuous tubing with outside diameter = 2.0 in and inside diameter = 1.7 in. The extruder barrel has a diameter = 4.0 in and length = 10 ft. The screw rotates at 50 rev/min; it has a channel depth = 0.25 in and flight angle = 16. The head pressure has a value of 350 lb/in2 and the viscosity of the polymer melt is 80  10-4 lb-sec/in2 . Under these conditions, what is the production rate in length of tube/min, assuming the extrudate is pulled at a rate that eliminates the effect of die swell (i. e., the tubing has the same OD and ID as the die profile)?