5. A Ferris wheel with a radius of 10 meters goes around once in 75
 second.
 a. How far does a person on the Ferris wheel travel while going around
 once?
 b. How far does a person on the Ferris wheel travel in one minute?
 c. What would the central angle be after that one minute?
 d. If a person is on the ride for 8 minutes, how far have they travelled in
 that time?