SOLUTION: A new printing press can print newspaper twice as fast as the old one can. . The old one can print the afternoon edition in 4 hours. Find how long it takes to print the afternoon e

Algebra ->  Rate-of-work-word-problems -> SOLUTION: A new printing press can print newspaper twice as fast as the old one can. . The old one can print the afternoon edition in 4 hours. Find how long it takes to print the afternoon e      Log On


   

Question 912805: A new printing press can print newspaper twice as fast as the old one can. . The old one can print the afternoon edition in 4 hours. Find how long it takes to print the afternoon edition if both printers are operating.
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
1/a+1/b=1/x
1/2+1/4=1/x
4/8+2/8=1/x
6/8=1/x
x=8/6
x=1.33333333 hours working together
check
x/a+x/b=1
x/2+x/4=1
1.33333333/2+1.33333333/4=1
0.66666667+0.33333333=1
1.0=1
ok
codewt