# Aptitude - Pipes and Cistern - Discussion

Discussion Forum : Pipes and Cistern - General Questions (Q.No. 2)

2.

Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in:

Answer: Option

Explanation:

Net part filled in 1 hour | 1 | + | 1 | - | 1 | = | 17 | . | ||

5 | 6 | 12 | 60 |

The tank will be full in | 60 | hours i.e., 3 |
9 | hours. |

17 | 17 |

Discussion:

56 comments Page 1 of 6.
Madhumita said:
2 months ago

First take a, b, c = 5, 6, 12.

Take a lcm of a, b, c = 60.

And divide by 5/60, 6/60, 12/60.

We get the answer of 12, 10,-5 because c can empty the tank it takes it as a negative term.

12 + 10 - 5 = 17.

Then divide by 60/17.

We get 3.58.

So, the answer is3(9/17).

Take a lcm of a, b, c = 60.

And divide by 5/60, 6/60, 12/60.

We get the answer of 12, 10,-5 because c can empty the tank it takes it as a negative term.

12 + 10 - 5 = 17.

Then divide by 60/17.

We get 3.58.

So, the answer is3(9/17).

(1)

Sanjiv said:
2 years ago

Superb explanation. Thanks @Manasa.

(3)

Akshay kenjila said:
3 years ago

@Manasa.

Soperb explainations. Thank you.

Soperb explainations. Thank you.

Naren said:
3 years ago

Thanks for explaining @Manasa.

BISWANATH TRIPATHY said:
3 years ago

How it is possible? Explain, please.

(1)

Marion said:
3 years ago

How does 60/17 become 39/17? Explain me.

Sireeshadevi koppisetti said:
4 years ago

Thanks @Subrat Kumar Dhani.

Rupa said:
5 years ago

@Sekhar.

17*3+9/60 = 60/17.

17*3+9/60 = 60/17.

Lavanya said:
5 years ago

Thanks all.

Ragavi said:
5 years ago

How to calculate it when the time is in minutes (intsead of hrs)? Please tell me.

(1)

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