POW 4, A Timely Phone Tree

POW 4, A Timely Phone Tree

Problem Statement:
POW 4 describes a situation involving a girl named Leigh and the new rules regarding phone use her parents had just come up with. Leigh‘s parents were concerned about how much time she was spending on the phone, so they decided to limit her phone time from 8 P.M. to 9 P.M. on school nights. Leigh's friends also had the same phone restrictions. In order to spread news more quickly and efficiently, they decided that all they needed was 3 minutes in which they could dial, make a connection, and finish the call. To start, Leigh would call Mike. Then she would call Diane, and he would call someone else. Therefore, no one would be called twice, and no one would ever get a busy signal. In this POW, we were asked to find out how many of Leigh's friends would be called between 8 and 9 P.M.
Process:
To begin working toward a solution, I figured that I had to write out at least the beginning of the phone tree. I wrote ...