An airplane moves forward at a speed of 971 km/hr. The frontal area of the intake to one of the jet engines is 0.80m2 , and the entering air density is 0.736 kg/m3 . A stationary observer estimates that relative to earth, the jet engine exhaust gases move away from the engine with a speed of 1,050 km/hr. The engine exhaust area is 0.558 m2 and the exhaust gas density is 0.515 kg/m3 . Estimate the mass flow rate of fuel into the engine in kg/hr.