Pipes and Cisterns Practice Test 2 with solutions

Question : 25 of 40

Marks: +1, -0

Pipe A is basically used as an inlet Pipe and pipe B is used as an outlet pipe. Pipe A and B both are opened together. When Pipe A fills the tank and B empty the tank, it will take double the time, when only A is opened. Find the ratio of time taken by Pipes A and B working.

3 : 4
1 : 2
4 : 5
2 : 3
Data inadequate

Validate

Solution:

Let the time taken by A to fill the tank = x hours
Time taken by both A and B together = 2x hours
Let time taken by B to empty the tank = y

1/x-1/y

1/{2x}

1/x-1/{2x}

1/y

1/x(1-1/2)

1/y

1/{2x}

1/y

y = 2x
So, the required ratio = x : 2 x = 1 : 2

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