SOLUTION: a printing shop starts a job at 10 A.M. on press A. Using this press alone, it would take 10 hours to complete the job. At 2 P.M. press B is also turned on, and both presses togeth

Algebra ->  Rate-of-work-word-problems -> SOLUTION: a printing shop starts a job at 10 A.M. on press A. Using this press alone, it would take 10 hours to complete the job. At 2 P.M. press B is also turned on, and both presses togeth      Log On


   



Question 857662: a printing shop starts a job at 10 A.M. on press A. Using this press alone, it would take 10 hours to complete the job. At 2 P.M. press B is also turned on, and both presses together finish the job at 5 P.M. How long would it take press B to do the job alone?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
7/10+3/b=1
b=10 hours working alone.