A cistern will be filled in 9 hrs, but becoz of an outlet it is filled in 10 hrs, if the cistern is filled, then how much time the outlet takes to empty the cistern.

• If it takes x hrs to empty a filled cistern by outlet, then
  cistern filled in 1 hour =
  1/9 - 1/x = 1/10
  1/x= 1/9-1/10= 1/90
  x= 90 hrs
• 12 years agoHelpfull: Yes(28) No(1)
• it takes the x hrs time
  from qestion
  1/9-1/10=1/x
  x=90 hrs
• 10 years agoHelpfull: Yes(1) No(0)