An insulated mixing chamber receives 4 lbm/s R-134a at 150 lbf/in 2, 220 F in a line with low velocity. Another line with R-134a as saturated liquid 130 F flows through a valve to the mixing chamber at 150 lbf/in 2 after the valve. The exit flow is saturated vapor at 150 lbf/in 2 flowing at 60 ft/s. Find the mass flow rate for the second line.