Ayden is planning to drive from City X to City Y. The scale drawing below shows the distance between the two cities with a scale of 1 inch = 25 miles.
City X
City Y
2 1/2 in.
If Ayden drives at an average speed of 50 miles per hour during the entire
trip, how much time, in hours and minutes, will it take him to drive from City
X to City Y?

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?