Two pipes A and B can fill a tank in 4 hours and 8 hours respectively. Both the pipes are opened simultaneously and pipe B is closed after one hour. The time taken in hours by A to fill the remaining part of the tank is..
Two pipes A and B can fill a tank in 4 hours and 8 hours respectively. Both the pipes are opened simultaneously and pipe B is closed after one hour. The time taken in hours by A to fill the remaining part of the tank is..