38 pages per hour
Step-by-step explanation:
Rate of reading =
By substituting the given values in the question,
Total number of pages read by Davida = =
Time taken by Davida = 45 minutes
Since, 1 minute = hours
Therefore, 45 minutes = hours
Rate of reading =
             =
             = 38 pages per hour
Therefore, rate of reading by Davida is 38 pages per hour.