SOLUTION: Sandy can complete her paper route in 45 min. When her sister Kris helps her. it takes them 18 min to complete the route. How long would it take Kris alone to complete the route?
Algebra.Com
Question 983609: Sandy can complete her paper route in 45 min. When her sister Kris helps her. it takes them 18 min to complete the route. How long would it take Kris alone to complete the route?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
If A can do a job in x time periods, then A can do 
of the job in 1 time period. Likewise, if B can do the same job in y time periods, then B can do 
of the job in 1 time period.
So, working together, they can do
of the job in 1 time period.
So, using minutes as your time period, 
as Sandy's work alone time and 
as Kris' work alone time, you have:
Solve for
John
My calculator said it, I believe it, that settles it
RELATED QUESTIONS
When working alone, Gail can finish her paper route in 6 hours. When Mike subsitutes for... (answered by venugopalramana)
when working alone, Gail can finish her paper route in 6hrs. When Mike substitutes for... (answered by venugopalramana)
It takes a girl 45 minute to deliver the papers on her route; however if her brother... (answered by mananth)
It takes a girl 45 minutes to deliver the newspapers on her route; however, if her... (answered by jim_thompson5910)
Judie can clean her room in 60 minutes if her sister can help her, it takes them 36... (answered by nyc_function)
virginia can deliver papers on her paper route in 30 minutes. When her brother Wayne... (answered by nerdybill)
Sheila can map their floor in 30 min and her sister Bunny in 45 min.How long it take them (answered by checkley79)
Allison can complete a sales route by herself in 6hrs working with an associate, she... (answered by ikleyn)
Jane can complete a sales route by herself in 45 minutes. Working with an assistant she... (answered by jorel1380)