Question

One pipe fills a storage pool in 3 hours. A second pipe fills the same pool in 3 hours. When a third pipe is added and all three are used to fill the pool, it takes only 1 hour. Find how long it takes the third pipe to do the job alone.

Answer 1

Do you know the final answer?

Answer 2

Just so that I can check my work.

Answer 3

\[\frac{ 1 }{ 3 }+\frac{ 1 }{ 3 }+\frac{ 1 }{x }=\frac{ 1 }{ 1 }\]

Answer 4

multiply all by 3 and solve for x