pipes A and B fill at A certain rate B is filled at 10, 20, 40, 80. If 1/4 of B if filled in 21 hours what time it will take to get completely filled

• 1/4 ->21 hours
  
  1/2->22 hours
  1(completely filled)->23 hours
• 13 years agoHelpfull: Yes(6) No(0)
• 23 hours
  because for 1/4 th of tank it is 21 hours
  1/2 fill 22
  for total fil 23
  such that the tank fill likes 20,40,60,...
• 13 years agoHelpfull: Yes(3) No(0)