A large reservoir at 600 K supplies air flow through a converging-diverging nozzle with a throat area

Question:

A large reservoir at 600 K supplies air flow through a converging-diverging nozzle with a throat area of 2 cm2,
A normal shock wave forms at a section of area 6 cm2. Just downstream of this shock, the pressure is 150 kPa. Calculate
(a) The pressure in the throat;
(b) The mass flow; and
(c) The pressure in the reservoir.