A cargo plane has the following characteristics:
Initial gross weight=30000lb; BSFC=0.45lb/BHP-hr; Cd=0.02+0.05Cl2; efficiency = 0.87, S=300ft2; cruise altitude=28000ft. This airplane is to carry 3000 lb of supply and airdrop it 1500 miles away and return to the original airport. Determine the total amount of fule consumed and the corresponding flying time.