Hi,

A pipe can fill a tank in 10 hours. 

If a second pipe is opened, the two pipes together can fill the tank in 6 hours. 

How long would it take the second pipe alone to fill the tank?

Translate into an equation: PER hr KEY

   |Multiplying thru by 60x so as all denominators = 1

   6x + 60 = 10x

        60 = 4x

         15hr = x 

Answer by josmiceli(19441)   (Show Source): You can put this solution on YOUR website!
 Add their rates of filling to get rate 

with both pipes open

1st pipe's rate:

( 1 tank ) / ( 10 hrs )

2nd pipe's rate: 

( 1 tank ) / ( x hrs )

Both together:

( 1 tank ) / ( 6 hrs )

----------------



Multiply both sides by 







The 2nd pipe alone can fill the tank in 15 hrs



 

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