SOLUTION: Please please HELP ME! I'm desperate!! It takes Jim 15 hours longer to build a wall than it does Cory. If they work together, they can build the wall in 18 hours. How long would it

Algebra ->  Rate-of-work-word-problems -> SOLUTION: Please please HELP ME! I'm desperate!! It takes Jim 15 hours longer to build a wall than it does Cory. If they work together, they can build the wall in 18 hours. How long would it      Log On


   

Question 999256: Please please HELP ME! I'm desperate!! It takes Jim 15 hours longer to build a wall than it does Cory. If they work together, they can build the wall in 18 hours. How long would it take Corey to build the wall alone?
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39625) About Me  (Show Source):
You can put this solution on YOUR website!
Sum of the rate of Jim and of Cory equals the combined rate for Jim & Cory working together. Unit for rate is WALL per HOURS.

c is the time for Cory to do 1 job himself.

           Jim         Cory        Jim&Cory

RATES      1%2F%28c%2B15%29     1%2Fc        1%2F%28c%2B15%29%2B1%2Fc=1%2F18

You should be able to choose very clearly what to do from here.

Answer by ikleyn(52847) About Me  (Show Source):
You can put this solution on YOUR website!
.
Similar problems are presented in the lesson  Using quadratic equations to solve word problems on joint work  in this site.

It is free of charge and without registration.

Read it attentively and then think how to adapt to your problem.  It is actually to substitute your data into that samples.