The inlet Mach number of the flow will be

Question

At the eye tip of a centrifugal impeller, blade velocity is 200 m/s while the uniform axial velocity at the inlet is 150 m/s. if the sonic velocity is 300 m/s. then the inlet Mach number of the flow will be                                      

(a) 0.50                        (b) 0.66

(c) 0.83                        (d) 0.87