Rate and work

Question

A teacher has 3 hours to check all the papers submitted by 35 students. She gets through the first 5 papers in 30 minutes. How much faster does she have to work to check the remaining papers in the allotted time? 

Answer 1

   3 hours =35 papers

- .5 hours = 5 papers

__________________

2.5 hours = 30 papers

1 hour = 30/2.5 papers = 12 papers

 

So she needs to read 12 papers per hour to meet the requirements.