Steam enters a converging nozzle at 5.0 MPa and 400C with a negligible velocity, and it exits

Question:

Steam enters a converging nozzle at 5.0 MPa and 400°C with a negligible velocity, and it exits at 3.0 MPa. For a nozzle exit area of 60 cm2, determine the exit velocity, mass flow rate, and exit Mach number if the nozzle
(a) Is isentropic and
(b) Has an efficiency of 94 percent.