Correct Answers: | |

Wrong Answers: | |

Unattempted: |

### Question 1

A tank is filled in $1{2/13}$ minutes by three taps running together. Times taken by the three taps to independently fill the tank are in an AP[Arithmetic Progression]. If the first tap is a leakage tap and the second tap takes 1 minute to fill the tank, then, the common difference of the AP can be?

**A**

4.

**B**

5.

**C**

3.

**D**

6.

**Soln.**

**Ans: a**

Let the times taken by the three taps be 1 - d, 1 and 1 + d. The time taken by the first tap will be negative because it is a leakage tap. Then ${15/13}$ minutes work of all the taps should add to 1. So we have, ${15/13}$ × $(1/{1 - d} + 1/1 + 1/{1 + d})$ = 1, which is same as $2/{1 - d^2} + 1$ = ${13/15}$. Solving we get d = ±4.

### Question 2

A tank is filled in 13 minutes by three taps running together. Times taken by the three taps independently are in an AP[Arithmetic Progression], whose first term is a and common difference d. Then, a and d satisfy the relation?

**A**

a^{3} - 39a^{2} - ad^{2} + 13d^{2} = 0.

**B**

a^{3} - 26a^{2} + ad^{2} + 13d^{2} = 0.

**C**

a^{3} - 13a^{2} - ad^{2} + 13d^{2} = 0.

**D**

a^{3} - 65a^{2} + ad^{2} + 13d^{2} = 0.

**Soln.**

**Ans: a**

Let the times taken by the three taps be a - d, a and a + d. Then 13 minutes work of all the taps should add to 1. So we have, $13 × 1/{a - d} + 13 × 1/a + 13 × 1/{a + d}$ = 1, which is same as a^{3} - 39a^{2} - ad^{2} + 13d^{2} = 0.

### Question 3

A city tanker is filled by two large pipes, X and Y, together in 42 and 28 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?

### Question 4

Two pipes, A and B, can fill a bucket in 13 and 14 mins respectively. Both the pipes are opened simultaneously. The bucket is filled in 6 mins if B is turned off after how many minutes:

### Question 5

Two taps X, Y and Z can fill a tank in 4, 18 and 7 minutes respectively. All the taps are turned on at the same time. After how many minutes is the tank completely filled?

**A**

$2{26/113}$ mins.

**B**

$3{29/112}$ mins.

**C**

$1{24/115}$ mins.

**D**

$5{16/115}$ mins.

**Soln.**

**Ans: a**

Let the time be x mins. Then sum of works done by X, Y and Z = 1. $x/4 + x/18 + x/7 = 1$. Solving, we get x = $2{26/113}$. Or use the shortcut ${abc}/{ab + bc + ca}$. Another thing, instead of solving the entire calculation, you can keep an eye on the options to find the nearest answer.

### More Chapters | See All...

Decimal Numbers | Alligations and Mixtures | Probability | Bricks and Blocks | Image Series | Averages | Volume and Surface Areas | Course of Action | HCF and LCM | Problems on Trains | More...

This Blog Post/Article "Pipes and Cisterns Quiz Set 008" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Updated on 2017-04-07.