text: algebra
  
  posted by .
  
  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.
  
  • algebra -
  
  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.
  
  • algebra -
  
  thanks drwls!
  are you available to answer one right now?
  
  • algebra -
  
  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?
  
  • algebra -
  
  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 (5-x) where x is the wind rate. The distance is obvious. solve for x.