pipes and cistern

Question

Pipes A and B can fill an empty bucket in 15 and 20 minutes respectively. The same full bucket can be emptied by another pipe C in 30 minutes. First A is opened for 1 minutes, followed B and then C for 1 minutes each. If the process continues like this, in how much total time will the bucket get filled?

Answer 1

A very complete and precise explanation was given yesterday by Nathan B.

https://www.wyzant.com/resources/answers/242857/pipes_and_cistern

 

Answer 2

Ashish,

 

Ditto. See Nathan B.'s solution.

 

https://www.wyzant.com/resources/answers/242857/pipes_and_cistern

 

I overfilled the tank! That was the flaw in my reasoning. I didn't consider that the tank couldn't hold more water!

 

Sorry if my solution confused you.