A cistern can be filled by two pipes and in and hours respectively and is then emptied by a tap in hours.If all the taps are opened,then cistern will be fill in how many hours?
Pipe ‘’ fills the cistern in hours, so in hour the part of cistern filled by pipe
Pipe ‘’ fills the csitern in hours, so in hour the part of cistern filled by pipe
A tap can empty the cistern in hours, so in hour the part of cistern emptied by tap
Now if we open all the pipes and taps, then the cistern is filled in part
Hence, inpart of cistern is filled.
Therefore, in the cistern is completely filled.