Answer:
Frank's rate of reading is 9 chapters per hour.
Explanation:
To find Frank's rate in chapters per hour, you can divide the total number of chapters he read (63) by the number of hours (7) it took him to read them:
Rate (chapters per hour) = Total chapters / Total hours
Rate = 63 chapters / 7 hours
Now, calculate the rate:
Rate = 9 chapters per hour
So, Frank's rate of reading is 9 chapters per hour.