Air enters a duct subsonically at section 1 at 1.2 kg/s. When 650 kW of heat is

Question:

Air enters a duct subsonically at section 1 at 1.2 kg/s. When 650 kW of heat is added, the flow chokes at the exit at p2 = 95 kPa and T2 = 700 K. Assuming frictionless heat addition, estimate
(a) The velocity; and
(b) The stagnation pressure at section 1.