SOLUTION: A woman can do a certain job in 5 hours. Her daughter can do it in 7 hours. After the woman and her daughter have been working for an hour, the woman's husband joined them. The thr

Question 829894: A woman can do a certain job in 5 hours. Her daughter can do it in 7 hours. After the woman and her daughter have been working for an hour, the woman's husband joined them. The three completed the job in 4 more hours. How long would it take the husband to finish the same job alone?
Please help.
Answer by josgarithmetic(39616) (Show Source): You can put this solution on YOUR website!
These are their rates in jobs per hour:
Woman, 1/5
Daughter, 1/7
Husband, 1/x

Uniform rates problems are as : Rate, time, job.

1 hour woman & daughter together.
4 hours woman & daughter & husband.

----- that is the equation in raw form for the one job to become done. Solve for x.

To begin solving that equation, multiply left and right members by the simplest common denominator, . This will clear the fractions. You do the rest.
RELATED QUESTIONS
A woman can do a certain job in 10 hr and the younger daughter can do it in 12 hr. After... (answered by richwmiller)

a woman can do a particular job in 10 hour and her daughter can do it in 12 hour. After a (answered by mananth)

1) A customer deposits Php 8000 in one simple interest account and Php 2000 in a second... (answered by josmiceli)

Shirley and Julia, working together, can finish a job in 1 hour and 20 minutes. After... (answered by stanbon)

Woman 1 can do a job in 2 hours and woman 2 can do the same job in 3 hours. How long... (answered by Alan3354)

Tiburcio can paint a certain room in 1 day. His daughter Alma can paint it in 2 days.... (answered by ankor@dixie-net.com)

The age of a woman and her daughter add up to 39years in 3years time the woman will be... (answered by ankor@dixie-net.com)

X can do a certain job in 10 hours and Y can do it in 12 hours. After X and Y have been... (answered by ptaylor,Theo)

blueberry can do a certain job in 10 hours and cheescake can do it in 12 hours. after... (answered by josgarithmetic)