A water tank has three taps A, B and C. Tap A, when opened,  can fill the water tank alone in 4 hours. Tap B, when opened, can fill the water tank alone in 6 hours and tap C, when opened, can empty the water tank alone in 12 hours. If taps A, B and C are opened simultaneously how long will it take to fill the tank completely?

A cistern has a leak which would empty the cistern in 20 minutes. A tap is turned on which admits 4 litres a minute into the cistern, and it is now emptied in 24 minutes. How many litres does the cistern hold?

A pipe can  fill a cistern in 20 minutes whereas the cistern when full can be emptied by a leak in 28 minutes. When both are opened, find the time taken to fill the cistern.

Fill pipe P can fill a cistern in 15 hours but it take 10 hour longer because of a leak in its bottom. How long will the leak take to empty the full cistern.

Two pipes A and B can fill a tank in 24 min and 32 min respectively. If both the pipes are opened simultaneously after how much time B should be closed so that the tank is full in 18 min ?

Two pipes A & B working independently can fill a cistern in 12 & 15 hours respectively. Including Pipe C while working together they take 4 hours to fill the complete cistern. In how many hours pipe C can fill the cistern working alone?

Pipe A can fill a tank completely in 5 hours. However, on account of a leak at the tank, it  takes 3 more hours to fill the tank. How long will the leak take to empty the full tank when pipe A is closed/shut?

Two pipes A & B can separately fill a tank in 12 hours and 16 hours respectively while a third pipe C can empty it in 48 hours. In what time will the tank be full, if all the pipes are opened together?

Three pipes A, B & C working independently can fill a cistern in 20, 30 & 60 hours respectively. In how many hours they can fill the cistern working together?

A pipe can fill a tank in 12 minutes and another pipe is 15 minutes but a third can empty it in 6 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?