1.Two pipes A and B can separately fill a tank in 10 and 15 minutes respectively. A third pipe C can drain off 30 liters of water per minute. If all the pipes are opened, the tank can be filled in 10 minutes. What is the capacity of the tank?
Ans : 450
2.In what time would a cistern be filled by three pipes which diameters are 2 cm, 3 cm and 4 cm running together, when the largest alone can fill it is 58 minutes? The amount of water flowing in each pipe is proportional to the square of its diameter.
Ans : 36
3.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
Ans : 6 hours
4.wo pipes A and B can fill a cistern in 3 hours and 5 hours respectively. Pipe C can empty in 2 hours. If all the three pipes are open, in how many hours the cistern will be full?
Ans : 30 hrs
5.A large cistern can be filled by two pipes P and Q in 15 minutes and 20 minutes respectively. How many minutes will it take to fill the Cistern from an empty state if Q is used for half the time and P and Q fill it together for the other half?
Ans : 12 min
6.Three pipes A, B and C can fill a cistern in 10 hours, 12 hours and 15 hours respectively. First A was opened. After 2 hour, B was opened and after 4 hours from the start of A, C was also opened. Find the time in which the cistern is just full.
Ans : 5hrs 44 min
7.A cistern can be filled with water by a pipe in 5 hours and it can be emptied by a second pipe in 4 hours. If both the pipes are opened when the cistern is full, the time in which it will be emptied is :
Ans : 20hrs
8.If the ratio of Rate of filling of two Pipes A and B is 3:2. If together they can fill a Tank
th of Tank in 20 minutes. Then in how many does A alone can fill the Tank?Ans : 40min
9.Two Pipes A and B together can fill a Tank in ‘X’ minutes. If ‘A’ is Inlet Pipe can Fill the Tank alone in 40 minutes less than ‘X’ minutes and ‘B’ is Outlet pipe can empty the Tank alone in 30 minutes less than ‘X’ minutes. Then together they can fill the empty Tank in how many minutes?
Ans :60 min
10.A pipe of diameter d can drain a certain water tank in 40 minutes. The time taken by a pipe of diameter 2d for doing the same job in :
Ans : 10 min
11.ap A can fill a tank in 20 hours, B in 25 hours but tap C can empty a full tank in 30 hours. Starting with A, followed by B and C each tap opens alternatively for one hour period till the tank gets filled up completely. In how many hour the tank will be 96% filled up?
Ans :
12. 34 Hours 60/7 Min
13. One fill pipe A is 3 times faster than second fill pipe B and takes 16 minutes less than the fill pipe B. When will the cistern be will be half full if both pipes are opened together?
Ans : 12 min
14. The ratio of efficiencies of two filling pipes is 4 : 5. There is a third emptying pipe which efficiency is two third of the average efficiency of first two filling pipes can empty a filled tank in 36 minutes. In how much time both the filling pipes can fill the tank when it is empty?
Ans :12 min
15.Pipe A, B and C can fill a Full Tank in 24,36 and 48 Minutes respectively. All three Pipes are Opened simultaneously in a Tank which is already filled up to
of its capacity. A and B are opened for only First 6 Minutes and closed thereafter.Then C alone filled remaining Tank. Then in total how many Minutes does C filled the Tank?Ans : 20 min
16.Pipe A can fill the tank in 10 hours, Pipe B can fill the tank in 12 hours and Pipe C can empty the tank in 15 hours. If all the three pipes are opened alternately(A,B and C), then how long will it take to fill the tank.
Ans : 25 hrs
17.Two pipes can fill a tank in 6hours and 8 hours .While a third pipe empties the full tank in 12hours.If all the three pipes are operate simultaneously, In how much time will the tank be filled ?
Ans : 4hrs 48 min
18.Pipe A can fill the cistern in 30 hours and Pipe B can empty the cistern in 12 hours respectively. If both pipes are opened together, how long will it take to fill the cistern?
Ans : 20hours
19. Two pipes A and B can fill a tank in 4 hours and 5 hours respectively. If they are opened on alternate hours and if pipe B is opened first, in how many hours, the tank fill in
Ans : 5 hrs
20 .Two Inlet Pipes A and B together can fill a Tank in ‘X’ minutes. If A and B take 81 minutes and 49 minutes more than ‘X’ minutes respectively, to fill the Tank. Then They can fill the of that Tank in how many minutes?
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