Pipes A and B, when working together, can fill an empty tank in 8 hours. If B is stopped after 2 hours, it will take a total of 11 hrs to fill the tank. How long would it take A to fill the empty tank alone?
Which country hosted the 'Bodhi Parva : BIMSTEC Festival of Buddhist Heritage' from 8-10 December 2017 as part of BIMSTEC's 20th anniversary celebrations?