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
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