1. A Cistern Can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours . If both the taps are opened simultaneously , then after how much time will the cistern get filled?

1. A water tank is two –fifth full . Pipe A can fill a tank in 10 minutes and pipe B can empty it in 6 minutes . If both the pipes are open, how long will it take to empty or fill the tank completely ?

1. Pipe A can fill a tank in 5 hours , Pipe B in 10 hours  and  pipe  C in 30  hours. If all the pipe are open, in how many hours will the tank be filled?

1. Pipes A and B can fill a tank in 5 and 6 hours respectively . Pipe C can empty it in 12 hours . If all the three pipes are opened together, then how many hours  the tank will be filled ?

1. A pump can  fill a tank with water in 2 hours . Because of a leak , it took \(2\frac{1}{3}\) hours to fill the tank . Find the time in hours  to  leak can drain all the water of the tank .

1. Two pipes A and B together can fill a cistern in 4 hours. Had the been opened separately , then B would have taken 6 hours more than A to fill the cistern . How much time will be taken by A to fill the cistern separately ?

1. One pipe can fill a tank three times as fast as another pipe . If together the two pipes can fill the tank in  36 minutes, then  find the time  of the slower pipe alone will be able to fill the tank .

1. 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 ?

Two pipe s A and B can fill a tank in 10 minutes and 15 minutes  respectively . If both the tape are opened simultaneously , and the tap A  is close after 4 minutes , then how much more time will it take to fill the tank by tape B ? 

Two pipe s A and B can fill a tank in 10 hours  and 20  hours   respectively . While a third pipe C can empty the full tank in 25 hours . All the three pipes are opened in the beginning. After 5 hours C is close . In how much time , will the tank be full ?