Answer:
20 minutes
Explanation:
Darryl is reading a book at the rate of 4.5 pages per minute.
∵ the speed of reading book of Darryl in one minute = 4.5 pages
∴ it would take him to read 90 pages =
![\frac{\text{pages to read}}{\text{pages per minute}}](https://img.qammunity.org/2020/formulas/mathematics/middle-school/ntufyz16n3b47gz75vw59i9wrdsq6pcrrl.png)
=
![(90)/(4.5)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/hjv6oy81x33gu2pb7ismzmd70fr9r3c5gi.png)
= 20 minutes
It would take 20 minutes Darryl to read 90 pages.