An 80-MVA, four-pole, 60-Hz synchronous generator operates at 0.90 power factor lagging. Its cylindrical rotor of 5-m length and 1.5-m diameter has the average mass density of 8.3 g/cm³. Assuming that the turbine rotor has inertia 1.5 × generator rotor inertia, determine the inertia constant H of this turbine-generator set.