Ms Lin has 6 hrs to finish a 400 page book. She has already read 150 pages. She read 40 pages in the first hour. What is the approximate number of pages she must read per hour to finish the book.
if she read 40 pages in 1 hour. She was able to read 1.5 pages a minute x 150 pages takes 225 minutes or 3.75 hours. to finish 250 left she have to read 4.1
rate of reading at the beginning = 40 pages/hr
at that rate the time to read 150 pages = 150/40 hrs
or 15/4 hours
Time left to read the other 250 pages = 6-15/4
or 9/4 hrs
rate of reading needed to finish the book
= 250/(9/4) = 111 1/9 pages per hour
or appr 1.85 pages per minute
To find the approximate number of pages Ms Lin must read per hour to finish the book, we need to calculate how many pages are left to read and divide it by the remaining time.
First, let's calculate how many pages are left to read:
Total number of pages in the book = 400
Pages already read = 150
Pages left to read = Total number of pages - Pages already read
Pages left to read = 400 - 150
Pages left to read = 250
Next, let's calculate the remaining time:
Total time to finish the book = 6 hours
Time already spent = 3.75 hours (225 minutes)
Remaining time = Total time to finish the book - Time already spent
Remaining time = 6 - 3.75
Remaining time = 2.25 hours
Finally, let's calculate the approximate number of pages Ms Lin must read per hour:
Pages to read per hour = Pages left to read / Remaining time
Pages to read per hour = 250 / 2.25
Pages to read per hour ≈ 111.11
Therefore, Ms Lin must read approximately 111.11 pages per hour to finish the book within the given time.