Critical pressure ratio is 0.5475. If the exit pressure is reduced to 3.2 bar then what will be the flow rate in m3/s?

Question

 Stream pressures at the inlet and exit of a nozzle are 16 bar and 5.2 bar respectively and discharge is 0.28 m³/s. Critical pressure ratio is 0.5475. If the exit pressure  is reduced to 3.2 bar then what will be the flow rate in m³/s? 

(a) 0.280                      (b) 0.328         

(c) 0.356                      (d) 0.455