A cistern can be filled by two pipes a and b in 10
and 15
hours respectively and is then emptied by a tap in 8
hours.If all the taps are opened,then cistern will be fill in how many hours?
A cistern can be filled by two pipes a and b in 10
and 15
hours respectively and is then emptied by a tap in 8
hours.If all the taps are opened,then cistern will be fill in how many hours?