56C+64R < 900056C+64R<900056, C, plus, 64, R, is less than, 9000 According to the inequality, at what rate does the airplane consume fuel while flying through clear skies, and how much fuel does it have before takeoff? The airplane consumes fuel at a rate of gallons per minute while flying through clear skies, and it has gallons of fuel before takeoff. Does the airplane have enough fuel to fly for 606060 minutes through clear skies and 909090 minutes through rain clouds?