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How much time would it take for Alan and Brian to paint it together?

If Alan had to paint it on his own, it would take him one hour more than the time it would take for all three to paint it together.

Would it be like this?

\(\displaystyle \frac1{A+1}=\frac1A+\frac1B+\frac1C\)?

Will it have something to do with quadratic equation?