SOLUTION: one person proofreads a copy for a small newspaper in 4 hours. If a second proofreader is also emplyoed, the job can be done in 2.5 hours. how long does it take for the 2nd proofr

Question 157874This question is from textbook
: one person proofreads a copy for a small newspaper in 4 hours. If a second proofreader is also emplyoed, the job can be done in 2.5 hours. how long does it take for the 2nd proofreader to do the job alone. This question is from textbook

Answer by vleith(2983) (Show Source): You can put this solution on YOUR website!
The first reader can do 1/4 of the job in an hour. (0.25 job/hour)
The two together can do 1/2.5 of the job in a hour. (0.4 job/hour)
You are asked to find the work rate of reader 2.

So reader 2 can do 0.15 job/hour.
How many hours to do the whole job?
h*0.15 = 1
h = 1/0.15
h = 6.666 hours (or 6 hours and 40 minutes)
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