algebra
posted by Ramie on .
If sally can type a certain number of mailing labels in 6 hours and eric and sue working together can type the same number of mailing lables in 4 hours, find how long it takes eric alone to type the mailing labels.

Assume there are N labels.
Sally mails S labels/h
Eric labels E labels/h
6 S = N
4 S + 4 E = N
4S + 4 E = 6 S
2 S = 4 E
S = 2 E
E is half as fast as S, and woul;d take 12 hours alone. 
thanks drwls!
are you available to answer one right now? 
Alex can run 5 miles per hour on levelground on a still day. One windy day he runs 11 miles with the wind, and in the same amount of time runs 4 miles against the wind. What is the rate of the wind?

Read the second bullet point on the first page, in the bold and italics, at the end of the second sentence.
I seriously, seriously hope you weren't dumb enough to use your real first name. Mine definitely isn't Serj.
time = distance/rate and you set the rate up as (5+x) and (5x) where x is the wind rate. The distance is obvious. solve for x.