Pipes and Cisterns Quiz 1

1)Two inlets A and B can fill a tank in 40 min and 1 hr respectively. If both are opened simultaneously then the tank will be filled in how much time?





2) A can fill a tank 20 min but B can empty it in 30 min when both are opened simultaneously then the tank will be filled in how much time?





3) Three inlets A, b and C fill a tank in 10 min, 20 min and 30 min respectively. The three pipes are opened simultaneously then the tank will be filled in how much time?





4) Two inlets A and B can fill a tank in 20 min and 30 min respectively the outlet C can empty it in 60 min, If the three pipes are opened simultaneously then the tank will be filled in how much time?





5) Inlet A can fill a tank in 10 min outlets B and C can empty the tank in 20 and 30 mins respectively. The three pipes are opened simultaneously then the tank will be filled or emptied in how much time?





6) Two pipes A and B can fill a tank in 40 and 50 min respectively both pipes are opened at the same time after 10 min A is closed then the tank can be filled in how much time?





7) Two pipes A and B can fill a tank in 40 and 60 min respectively both pipes are opened at the same time after 20 min B is closed then the tank can be filled in how much time?





8) Two pipes A and B can fill a tank in 20 and 30 min respectively first A opens after 10 min B also opens then the tank can be filled in how much time?





9) Two pipes A and B can fill a tank in 30 and 40 min respectively first B opens after 20 min A also opens then the tank can be filled in how much time?





10) Two pipes A and B can fill a tank in 10 and 16 min respectively both pipes are opened at the same time after some time A is closed but the tank is full in 8 min how much time A is closed?







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