Answer: There is average number of paged he read each hour is 15 pages per hour.
Explanation:
Since we have given that
Number of pages of a book = 90
Number of hours he reads = 6 hours
As we know the formula for average number of paged he read each hour.
Average number of paged is given by

Hence, there is average number of paged he read each hour is 15 pages per hour.