Pipes and Cisterns Quiz Set 016 | Maths Aptitude Quiz Questions and Mock Test on Pipes and Cisterns Set 16 | mock tests for Bank PO, SSC Exams, SO Clerical Exam, GATE Exam, LIC AO, GIC AO, etc.

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Question 1

A city tanker is filled by two large pipes, X and Y, together in 24 and 16 minutes respectively. On a certain day, pipe Y is used for first half of the time, and both X and Y are used for the second half. How many minutes does it take to fill the tank?

12 mins.

13 mins.

11 mins.

14 mins.

Soln.
Ans: a

Let the time taken be x. Y is running for x mins, and X for x/2. So $(x/16 + x/{2 × 24})$ = 1. Solving for x, we get x = 12 mins.

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Question 2

Pipe A can fill a cistern in 60 minutes, while the pipe B can fill it in 40 minutes. They are alternately open for 1 minute. How long will it take the cistern to fill completely?

48 mins.

49 mins.

47 mins.

50 mins.

Soln.
Ans: a

Let the total time taken be 2x minutes. Both X and Y run for x mins. So $(x/40 + x/60)$ = 1. Solving for x, we get x = 24, which gives 2x = 48.

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Question 3

Two ink dispensers discharge ink into a color mixer. The first one can fill it in 21 minutes, whereas the second can fill it in 7 minutes. Both them are opened at the same time, but the second ink dispenser is turned off after 4 minutes. What is the total time required to fill the color mixer cistern?

9 mins.

10 mins.

8 mins.

11 mins.

Soln.
Ans: a

If the total time is T, the sum of works done by the ink dispensers are $T/21 + 4/7$ = 1. Solving, T = 9 mins.

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Question 4

Three taps R, G and B are supplying red, green and blue colored inks into a tub. They can independently fill the tub in 7, 3 and 6 minutes. They are turned on at the same time. What is the ratio of blue ink after 3 minutes?

${7/27}$.

$1{4/13}$.

${7/29}$.

$3{1/29}$.

Soln.
Ans: a

Let the time taken by them to independently fill the tank be r, g and b minutes. Ink discharged by the blue tap is $3/b$. The total of all the inks is $3/r + 3/g + 3/b$. The ratio is ${1/b}/{1/r + 1/g + 1/b}$, which simplifies to ${rg}/{rg + gb + br}$ = ${7/27}$.

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