SOLUTION: one pipe can fill a swimming pool in 10 hours. if a second pipe is used together with the first pipe, the pool can be filled in 6 hours. how long would it take the second pipe alon

Question 689374: one pipe can fill a swimming pool in 10 hours. if a second pipe is used together with the first pipe, the pool can be filled in 6 hours. how long would it take the second pipe alone to fill the pool?

Answer by Edwin McCravy(20054) (Show Source): You can put this solution on YOUR website!
one pipe can fill a swimming pool in 10 hours. if a second pipe is used
together with the first pipe, the pool can be filled in 6 hours. how long would
it take the second pipe alone to fill the pool?

We are given the first pipe's filling rate as 1 pool per 10 hours, or
 or 

We let X = the number of hours it takes ths second pipe to fill the pool.

So we can say the second pipe's filling rate is 1 pool per X hours, or
 or .

We are given their combined filling rate as 1 pool per 6 hours, or
 or .

The equation comes from:

      .

              

Solve that by getting an LCD of 30X

Answer:  X = 15 hours.

Edwin

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