Air flows through a pipeline restriction isentropically at 1.0 kg/s. At the restriction inlet, the gas pressure and temperature are 10 bar and 300 K respectively. At the restriction outlet, the diameter is 25 mm and the pressure is 7 bar. Determine: (a) the speed of sound at the restriction inlet, (b) the gas temperature, velocity, speed of sound and Mach number at the restriction outlet.