SOLUTION: Ken mows the lawn in 40 minutes. When Kayla helps, it only takes 15 minutes. How long will it take Kayla to mow the lawn by herself?

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Question 892449: Ken mows the lawn in 40 minutes. When Kayla helps, it only takes 15 minutes. How long will it take Kayla to mow the lawn by herself?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
1/40+1/k=1/15
k = 24
Kayla, working alone, can do it in 24 minutes.
check
1/40+1/24=1/15
1/8*5+1/8*3=1/3*5
3/3*8*5+5/5*8*3=8/8*3*5
8/8*3*5=8/8*3*5
8/120=8/120