SOLUTION: A father can do a job in certain number of days. His son takes twice as long to do the job. Working togather, they can do the job in 6 hours. How many hours does it take father to

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: A father can do a job in certain number of days. His son takes twice as long to do the job. Working togather, they can do the job in 6 hours. How many hours does it take father to       Log On


   

Question 829321: A father can do a job in certain number of days. His son takes twice as long to do the job. Working togather, they can do the job in 6 hours. How many hours does it take father to do the job?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Father rate, 1%2Fx
Son rate, 1%2F%282x%29
Together, job needs 6 hours, which means the rate when Father and son together, 1%2F6.

1%2Fx%2B1%2F%282x%29=1%2F6, and you can find BOTH rates when you know x.
Solve for x.