Asked by Vee

How is this problem solved?

It takes Bobby 60 minutes longer to wax the car than it does his brother Kevin. Together it takes them 50 minutes to wax the car. How long does it take each working separately?
Answered by Steve
If Kevin takes x minutes,

1/50 = 1/(x+60) + 1/x
x = 10(2+√34) =~ 78.3

So
Kevin takes 78.3 minutes,
Bobby takes 138.3 minutes.

Answered by Vee
Thank you.
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