A subsonic airplane is flying at a 3000-m altitude where the atmospheric conditions are 70.109 kPa and

Question:

A subsonic airplane is flying at a 3000-m altitude where the atmospheric conditions are 70.109 kPa and 268.65 K. A Pitot static probe measures the difference between the static and stagnation pressures to be 35 kPa. Calculate the speed of the airplane and the flight Mach number.