EASY
Earn 100

Their pipes A, B, and C can fill a tank from empty to full in 30 minutes, 20 minutes, and 10 minutes respectively. When the tank is empty, all the thick pipes are opened. A, B, and C discharge chemical solutions P, Q, and R respectively. What is the proportion of the solution R in the liquid in the tank after 3 minutes? 

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Important Questions on Ratio and Proportion

HARD
Numerical and Mental Ability>Arithmetic>Ratio and Proportion>Pipes and Cistern

Of the three pipes, the first two can fill an empty tank in 10.8 and 21.6 hours respectively, while the third pipe can empty the tank in 18 hours. If the tank is empty and all the three pipes are opened together then in how many hours will tank fill?

MEDIUM
Numerical and Mental Ability>Arithmetic>Ratio and Proportion>Pipes and Cistern

Pipe A in comparison to pipe B fills a tank in one fourth time. Pipe C in comparison to pipe A takes 3 times more time to fill the tank. If the three pipes are opened together, the tank is filled in 24 hours. If Pipe C is not opened, how much time will it take to fill the tank?

MEDIUM
Numerical and Mental Ability>Arithmetic>Ratio and Proportion>Pipes and Cistern
Pipe A can fill a tank in 15 hours and pipe B can fill the same tank in 18 hours. Pipe C can empty the same full tank in 9 hours. If all the pipes are opened together, then what portion of the tank will be filled after 6 hours?
MEDIUM
Numerical and Mental Ability>Arithmetic>Ratio and Proportion>Pipes and Cistern
Two pipes A and B can fill a tank in 45 minutes. If pipe A can fill an empty tank in 1 hour, how long will it take pipe B to fill the empty tank?
MEDIUM
Numerical and Mental Ability>Arithmetic>Ratio and Proportion>Pipes and Cistern
Three taps R, S and T can fill a tank in 90, 100 and 180 minutes respectively. If all the taps are opened together, then in how many minutes will the tank be filled?
EASY
Numerical and Mental Ability>Arithmetic>Ratio and Proportion>Pipes and Cistern
A pump can fill a tank with water in 1 hour. Because of a leak, it took 113 hours to fill the tank. In how many hours can the leak alone drain all the water of the tank when it is full?
MEDIUM
Numerical and Mental Ability>Arithmetic>Ratio and Proportion>Pipes and Cistern
A, B and C are three pipes joined to a tank. A and B together can fill an empty tank in 6 hours, B and C together can fill it in 10 hours and C and A together can fill it in 712 hours. What time will pipe A alone take to fill the tank?

 

MEDIUM
Numerical and Mental Ability>Arithmetic>Ratio and Proportion>Pipes and Cistern
Pipes A and B are filling pipes while pipe C is an emptying pipe. A and B can fill a tank in 72 minutes  and 90 minutes respectively. When all the three pipes opened together. the tank gets filled in 2 hours. A and B are opened together for 12 minutes, then closed and C is opened. The tank will be empty after:
MEDIUM
Numerical and Mental Ability>Arithmetic>Ratio and Proportion>Pipes and Cistern
Two valves X and Y Can Separately fill a tank in 20 hours and 30 hours, respectively. Both the valves are opened to fill the tank but when the tank is one third full the valve is closed. A leak develops in the tank through which one third of the water supplied by both the valves leaks out. The leak is immediately closed and the two valves are again opened. What is the total time taken to fill the tank? 
MEDIUM
Numerical and Mental Ability>Arithmetic>Ratio and Proportion>Pipes and Cistern
 Pipe A and Pipe B can fill a tank in 4 and 16 hours respectively. How long will they take to fill in the tank working together? 
EASY
Numerical and Mental Ability>Arithmetic>Ratio and Proportion>Pipes and Cistern
A pipe can fill a tank in 30 minutes. Due to two leakages A and B, the filled tank would be drained off in 112hour and 114hour
respectively. How long will it take to fill the tank if the pipe, A and B are left open?
MEDIUM
Numerical and Mental Ability>Arithmetic>Ratio and Proportion>Pipes and Cistern

Two pipes separately take 5 hours and 8 hours respectively to fill a tank. The third pipe takes 3.2 hours to drain out the water from the tank. How much time will all the three pipes take to fill the completely empty tank?

MEDIUM
Numerical and Mental Ability>Arithmetic>Ratio and Proportion>Pipes and Cistern
Two pipes can fill a cistern in 72 and 90 minutes respectively, If both the pipes are left open how long will it take for the cistern to be half full?
EASY
Numerical and Mental Ability>Arithmetic>Ratio and Proportion>Pipes and Cistern
Two pipes A and B can fill a cistern in 1212 hours and 25 hours, respectively. The pipes are opened simultaneously, and it is found that due to a leakage in the bottom, it took 1 hours 40 minutes more to fill the cistern. When the cistern is full, in how much time will the leak empty the cistern?
MEDIUM
Numerical and Mental Ability>Arithmetic>Ratio and Proportion>Pipes and Cistern
The dimensions of a swimming pool are 66 m × 35 m × 3 m. How many hours will it take to fill the pool by a pipe of diameter 35 cm with water flowing at speed 8 m/s?
EASY
Numerical and Mental Ability>Arithmetic>Ratio and Proportion>Pipes and Cistern
Three pipes A, B and C can fill a cistern in 15, 24 and 36 minutes respectively. If pipe D can drain a full tank in 1 hour. how long will it take for the tank to be filled if all the four pipes are kept open together_____.
MEDIUM
Numerical and Mental Ability>Arithmetic>Ratio and Proportion>Pipes and Cistern
12 buckets of water fill a tank when the capacity of each bucket is 13.5 litres. How many buckets will be needed to fill the same tank. If the capacity of each bucket is 9 litres?
MEDIUM
Numerical and Mental Ability>Arithmetic>Ratio and Proportion>Pipes and Cistern
Two pipes X and Y can fill a tank in 24 and 32 hours respectively. If both the pipes are opened at the same time, then after how many hours should the first pipe be closed so that it takes only 16 hours to fill in the tank.
EASY
Numerical and Mental Ability>Arithmetic>Ratio and Proportion>Pipes and Cistern
Inlet Pipe A can fill a cistern in 32 hours, Whereas outlet Pipe B can drain the filled cistern in 40 hours. The two pipes are opened together when the cistern is empty, but the outlet pipe is closed when the cistern is three-quarters full. How many hours will it take to fill the complete cistern?  
MEDIUM
Numerical and Mental Ability>Arithmetic>Ratio and Proportion>Pipes and Cistern
Three taps A, B, and C together can fill an empty cistern in 10 min. The tap A alone can fill it in 30 min and then tap B alone in 40 min. How long will the tap C alone will take to fill it?