+0  
 
0
52
1
avatar

With pipe 2 closed, pipe 1 will fill the water tank in 1 hour.

With pipe 1 closed, pipe 2 will empty the water tank in 2 hours.

If both pipes are open, how long will it take for the water tank to fill ?

 Dec 5, 2019
 #1
avatar+19851 
0

Rate for pipe 1   1 tank/1hour = 1

Rate for pipe 2   1 tank/2 hours = 1/2

 

1 tank / (1 tank / hour - 1/2 tank/hour) = 1 tank /(1/2 tank/hour) = 2 hours      (edited...misread the Q)

 Dec 5, 2019
edited by ElectricPavlov  Dec 5, 2019

17 Online Users

avatar