This Site can be best viewed in Mozilla or Internet Explorer.
Pipes and cisterns-Hard test 2
Taps M, N and O are attached with the tank and velocity of water coming through them are 24 liters per hour, 65 liters per hour and 84 liters per hour. M and N are inlets and O is outlet. If all the taps are opend together then the tank is filled in 20 h. Calculate the capacity of the tank.
Two taps A and B can fill a tank in 25 min and 20 min respectively. But the taps are not opened properly, so tap A allows only th part of water and tap B allows only rd part of water. Now how long will they take to fill the tank?
Three taps X, Y and Z are attached with the tank and velocity of water coming through them are 50 liters per hour, 75 liters per hour and 100 liters per hour. X and Z are inlets and Y is outlet. If all the taps are opend together then the tank is filled in 5 h. Calculate the capacity of the tank.
Pipes M and N can fill a tank in 40 hours and 20 hours respectively. A third pipe O empties the tank in 10 hours. Calculate the time in which the tank will be filled if all the pipes are opened together.
Answer: Option B
According to the formula, If pipe M and N fills a tank in x and y hours respectively, but a third pipe O empties the full tank in z hours then the net portion filled in 1 hour when all of them are opened together is hours.
Hence, the tank will be filled in 40 hours when all the pipes are opened simultaneously.