Two pipes can fill a tank in 20 minutes,end 30 minutes respectively. If both the pipes are opened simultaneously then the lank will he filled
Number of minutes Pipe A requires to fill an empty tank : 20 minutes
Number of minutes Pipe B requires to fill an empty tank : 30 minutes
Amount of water filled by Pipe A in empty tank in one minute: 
Amount of water filled by Pipe B in one minute: 
Amount of water filled by Pipe A and Pipe B together in one minute: 
= 
= 
They can fill the tank together in 12 minutes.
14