SOLUTION: Working together, two computers can execute a program in 5 hours. Individually, the older model requires 3 hours longer than the newer model to execute the program.

Algebra ->  Rate-of-work-word-problems -> SOLUTION: Working together, two computers can execute a program in 5 hours. Individually, the older model requires 3 hours longer than the newer model to execute the program.      Log On


   



Question 815902: Working together, two computers can execute a program in 5 hours. Individually, the
older model requires 3 hours longer than the newer model to execute the program.

Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Let h = the time in hours for the new computer to do THE ONE JOB.
Theses numbers or expressions represent the three different work rates:
Old, 1/(h+3)
New, 1/h
Together, 1/5
Watch carefully that those rates are in jobs per hour.

Old computer's rate plus New computer's rate is the rate for both computers working together.

highlight%281%2F%28h%2B3%29%2B1%2Fh=1%2F5%29
If you solve for h, then you can also determine or compute the old computer's rate.