"A bath can be filled   by the cold water pipe in 10 minutes and by the hot water pipe in 15 m
Channel: Doubtnut
Date: 2020-07-12

"A bath can be filled
 
  by the cold water pipe in 10 minutes and by the hot water pipe in 15 minutes.
 
  A person leaves the bathroom after turning on both the pipes' Ile returns
 
  just when the bath should have been full. Finding however, the waste pipe was
 
  open, he closes it. In 4 minutes more, the bath is full. In what time will
 
  the waste water pipe empty it?
 `6\ m inu t e s`
 b. `\ 8\ m inu t e s`
 
 c. `9\ m inu t e s`
 d. none
 
  of these"