SOLUTION: It takes 45 min for a mother to clean her house. Her daughter can do the job in 1 hour. If they work togther, how long will it take them to clean the house

Algebra ->  Rate-of-work-word-problems -> SOLUTION: It takes 45 min for a mother to clean her house. Her daughter can do the job in 1 hour. If they work togther, how long will it take them to clean the house       Log On


   

Question 1118324: It takes 45 min for a mother to clean her house. Her daughter can do the job in 1 hour. If they work togther, how long will it take them to clean the house
Answer by josgarithmetic(39614) About Me  (Show Source):
You can put this solution on YOUR website!
JOB per HOUR,


1%2F%283%2F4%29%2B1%2F1

4%2F3%2B1

4%2F3%2B3%2F3

7%2F3, JOBS per HOURS
or 3%2F7 HOURS per JOBS
which is about 0.42857 hours or about 25 minutes 40 seconds