What is the steam velocity at the exit if expansion is isentropic?

Question

Total enthalpy of stream at the inlet of a nozzle is 2800 kJ while static enthalpy at the exit is 2555 kJ. What is the steam velocity at the exit if expansion is isentropic?

         (a) 70 m/s                       (b) 245 m/s

         (c) 450 m/s                     (d) 700 m/s