Arithmetic Questions And Answers :: Pipes Cisterns: part1

16.A leak in the bottom of a tank can empty the full tank in 6 hours. An inlet pipe fills water at the rate of 4 litres per minute. When the tank is full the inlet is opened and due to the leak the tank is empty in 8 hours. The capacity of the tank is:

17.One tap can fill a cistern in 2 hours and another can empty the cistern in 3 hours. How long will they take to fill the cistern if both the taps are opened?