Freshers India

A tap can fill a tank in 16 minutes and another can empty it in8 minutes. If the tank is already half full and both the tanks are oped together, the tank will be:                        

A tank is filled in 5 hours by three pipes A, B and C. The pipe C is twice as fast as B and B is twice as fast as A. How much time will pipe A alone take to fill the tank?                        

Bucket Phas thrice the capacity as bucket Q It takes 60 turns for bucket P to fill the empty drum. How many turns it wifi take for both the buckets P and Q, having each turn together to fill the empty drum?. [Bank P.O. 1989]                        

P, Q and R are three pipes connected to a tank. P and Q together fill the tank in 4 hours. R and Q together fill the tank in 6 hours. P and R together fill the tank in 5 hours. In how much time will P, Q and R fill the tank together?                        

Two taps A and B can fill a tank in 10 hours and 15 hours respectively. If both the taps are opened together, the tank will be full in:                        

Two pipes A and B can fill a tank in 25 minutes and 35 minutes respectively. But a third pipe C can empty it in 10 minutes. The first two pipes are kept open for 5 minutes in the beginning and then the third pipe is also opened. In what time is the cistern emptied?