Carlos is going on a boat tour. The boat will travel a total distance of 35 kilometers during the 7-hour tour. If the boat travels at a constant speed during the tour, what distance in kilometers should the boat travel in 3 hours?

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?