Two pipes A and B can fill a tank in 12 minutes and 18 minutes respectively. If both the pipes are opened simultaneously, how long will they take to fill the tank ?

Two pipes A and B can fill a tank in 45 hours and 36 hours, respectively. If both the pipes are opened simultaneously, how much time will be taken to fill the tank ?

Two pipes A and B can fill a tank in 18 h and 12 h, respectively. If both the pipes are opened simultaneously, how much time will be taken to fill the tank?

Two pipes A and B can fill a tank in 18 and 6h , respectively . If both the pipes are opened simultaneously , how much time will be taken to fill the tank?

Two pipes A & B can fill a tank in 36 hours and 45 hours respectively. If both the pipes are opened simultaneously. How much time will be taken to fill the tank?

Two pipes A and B can fill a tank in 18 minutes and 24 minutes respectively. If both the pipes are opened simultaneously, then after how much time should pipe B be closed so that the tank is full in 12 minutes?

Two pipes A and B can fill a tank in 24 minutes and 32 minutes respectively.If both the pipes are opened simultaneously,after how much time B should be closed so that eh tank is full in 18 minutes?

Two pipes A and B can fill a tank in 12 and 16 min, respectively. If both the pipes are opened simultaneously , after how much time should B be closed so that the tank is full 9 min ?