Two pipes A and B can fill the tank in 37.5 minutes and 45 minutes respectively ,If both the tanks are opened together then,after how minutes the tap B should be close to fill the tank fully in half an hour ?

• 9 min
  A can fill the cistern in 75/2 min
  hence work done by it is 2/75*30=4/5
  So remaining 1/5 work is done by B and B takes 45 min to fill the cistern hence
  1/5 of cistern will be filled in
  1/5*45=9 min
• 9 years agoHelpfull: Yes(1) No(0)