A standard airline jet has 25,812 gallons of fuel and burns 4.2 gallons per mile. A jumbo airline jet has 31,311 gallons of fuel and burns 5.5 gallons of fuel per mile. How many miles () must each jet travel so they both have the same amount of fuel remaining?

Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?